Guys, I have the same problem and it's not funny anymore. Do I really have to re-install Windows or you are able to help? I'm asking because there has been a month since you answered this post
I have the exact same problem with Windows 10. Considering contacting my attorney.
Just tried turning on my pc and it is stuck in Win7 "Starting Windows". Try in safe mode and I see it stalls at loading avgardisk.sys.
Dear All,
I'm facing the same problem, I will give a short description of my system installation:
Bootloader: Grub2, but all time, the mbr 446 bytes saved with dd, in every state, it means that i can restore a difrent OS bootloaders, any time, with Sysrescd Live spin.
ATTENTION: dd can destroy the whole data on your hdd, if you don not know how to use it.
(Remark: If you try to install Sp1 to Win7, you need it's own ntldr bootloader in mbr, with grub2 in mbr, you can not install sp1 to win7.)
My goal of installation should look like this:
/dev/sda1 (active boot flag) = fs type ext4 Centos 7
/dev/sda2 = fs type ntfs (drive c:) - Windwos 7 x64 SP1
/dev/sda3 = fs type ntfs (drive d:) - Windwos 7 x86
The problem is with /dev/sda3 - can not boot avgrdisk.sys, bricks the system.
Installation order:
1st sda2 Windwos 7 x64 - Devops workstation (AVG FREE installed)
2nd sda1 Centos 7 - I need linux, because it never fails, resistive to viruses 
3rd sda3 windows 7 x86 - Compatibility to old 32bit devices.
My installation technique is, I set active boot flag to sda3 and change partition type sda2 partition type to Hidden NTFS because this way the windows installer will not see the other windows system instance. I prefere to use Grub2 to manage the boot targets, instead of windows built in.
On sda3, at the end of the installation of win7 x86, the local user account created finally. After reboot the Windows 7 x86 on sda3 can not load avgrdisk.sys. Bricked.
Remeber: sda3 is ntfs + bootflag set, sda2 invisible fstype hidden ntfs.
What to do now?
I restored the Centos 7 boot record using Sysrescd live spin with the command "dd if=/path/to/mbr446.centos7 of=/dev/sda bs=446 count=1", set my active boot flag to sda1. Set sda2 fstype back to ntfs.
With this configuration: Centos 7 boot = OK!
Grub2 loads well Win7 x64 Sp1 with custom conf:
menuentry "Windwos 7x64" {
set root=(hd0,2) # First HDD, 2nd partition
chainloader +1
}
Win7 Sp1 x64 System is running and healty. OK!
Let's try to load the new install: Windows7 x86
menuentry "Windwos 7x86" {
set root=(hd0,3) # First HDD, 3rd partition
chainloader +1
}
Win7 Sp1 x64 booted instead of Win7 x86!!!
Cofiguration 100% -ok, My laptop uses the same boot configuration.
At this point, I decided to load back the MBR record of win7 x86 and set sda3 bootflag active, set sda2 to hidden ntfs (revert back to post installation partition schema of Win7 x86).
I can not figure out why Bricked on loading avgrdisk.sys after succesfully avgbuniv.sys and avgbidsh.sys was loaded to the system.
But wait a minute, How it possible that a fresh install of Win7 x86 (never logged into the desktop) loading succesfully avgbuniv.sys and avgbidsh.sys while the other Windows7x64 on sda2 filesystem is set to hidden ntfs.
After checking with Centos7 the avgbuniv.sys and avgbidsh.sys not exist on sda3 (Win7 x86).
I uninstalled AVG Free from Win7 x64 while MBR was also restored to it's own ntldr, still unable to boot Win7 x86. No success.
What should i do? Should I reinit the whole HDD with /dev/zero? I'm very upset.
My Question is: During AVG install, where are avgbuniv.sys and avgbidsh.sys registered to?
p.s.: I use a free version of avg, as i see this topic is older than one year, probably my solution is to add another HDD to the workstation, and boot with grub2.
But this solution is like the same as your car's engine failed, nobody can repair, so the solution is to buy another car?!
The real solution should be try to look another repairmen or service station, how knows the know how, how to repair.
Sincerely waiting to your kindly solution.
The world would be much better with Unix systems… and i wasted 5 hours to investigate this matter, instead of working on my k8s threads. Now I'm going to look for an unused sata hdd in my basement.
Wish better luck.
I'm having the exact same problem! Has anyone found a solution for this??
Hello from december 2021.
windows 7 pro is bricked by this file.
This is is last nail in AVG coffin. Sorry boys, all my administered co.panies will not use your products.
Why win7? There are special legacy devices used in various industries.
The community fixed the problem rather than the Dev itself 
Alright, Stephen. Please reinstall Operating system and AVG programs. Monitor the progress and keep us informed here about it.
Thank you.
I managed to fix this issue by using the windows boot media, and using command prompt to replace the existing avgArDisk.sys file with another version from another PC I had.
That fixed the issue for me.
Thank you IBM Ace!
Had this same major issue on an iMac running win 7 via bootcamp and solved it by running efi boot via usb and overwriting the corrupt file from the other folder.
So far so good
Having established that when the AVG disk driver avgsrdisk.sys is installed, Windows 7 WEI fails consistently, I have found a much worse problem :-
If avgsrdisk.sys is removed, renamed or corrupted, then Windows will not boot at all, not even in safe mode!
You can't boot at all using any of the safe mode options, forcing a Windows re-install.
This is a very important issue for an anti-virus program - If something gets onto your system somehow and just renames avgsrdisk.sys, then your system becomes un-bootable.
The only way round this without a complete Windows re-install is to get into Dos mode via the Windows recovery disk (If you have one) and re-instate avgsrdisk.sys from a backup.
This is a serious security problem.
I've got the same issue, win 7 32 bit, wont boot at all, safe mode cmd prompt fails at loading avgardisk.sys, usual windows repir tricks wont work, is there an actual fix for this apart from re installing the OS?
THIS IS NOT AN ANSWER
avgArDisk.sys has stopped my laptop from working properly. I have been coming back for days after repeatedly asking for help to remedy the problem with avgArDisk.sys
Hi there.
5th December 2019
Windows updated today however nothing changes as regards me not being able to get 'on' my laptop as I have always done by entering my correct password and logging into Windows.
Windows 7 Home Premium
Service Pack 1
Hewlett-Packard
HP G56 Notebook PC
Pentium (R) Dual-Core CPU T4500 @ 2.30GHz 2.29 GHz
RAM: 4.00GB
64-bit Operating System
Please can someone reply as occasionally having access via Safe Mode every now and then because of avgArDisk.sys will not permit me to run any other modes, to fix the problem that is that same file avgArDisk.sys, is an irony that wore instantly thin when I lost proper access to my laptop.
I have accidentally posted this matter as an answer on another thread.
It had been days since avgArDisk.sys completely messed up me being able to use my laptop.
In Safe Mode (and No other version of Safe Mode), after getting 'stuck' (hangs) @ avgArDisk…sys for a while, the windows login in page appears. I can type in my password and it is recognised and allows me to login in Windows.
I cannot do that on any Safe Mode option, ie networking etc because the system gets to avgArDisk.sys and just hangs then restarts.
When the laptop starts normally and the Windows 7 login page appears and I put in my correct password it says the my User Interface does not recognise me. Nb: This self password is used in Safe Mode and allows me to login Windows 7
This is a much reported problem since at least April 2019 here and before that in Windows forums.
I simply want to get proper access to my laptop before avgArDisk.sys changed all that.
Please reply.
I don't have a Windows 7 disk. Safe Mode in essence just let's me on.
Please reply with a right and proper solution/patch for the commonly occurring error.
Thanks
AGAIN THIS IS NOT AN ANSWER
*** I NEED URGENT HELP ***
AVGARDISK.SYS WILL NOT ALLOW MY LAPTOP TO RUN PROPERLY.
I HAVE NOT HAD PROPER ACCESS FOR DAYS
PLEASE REPLY
PLEASE CAN SOME ONE REPLY
Ok Everyone, I figured it out :-) when something acts like a virus you need to treat it like a virus. In order to delete the dreded avgArDisk.sys file for good and leave your system bootable you must remove it's corresponding registry keys but you can't do it with registry editor you need the Malwarebytes tool Regassassin (FREEWARE) you can download it here https://www.malwarebytes.com/regassassin/
This is a stand alone program meaning no install necessary just download the file and double click it.
Once you have the program open you need to copy and paste the following registry keys in one at a time and click delete, say ok to the warnings:
HKEY_LOCAL_MACHINE\SOFTWARE\AVG
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\AVG
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\avgArDisk
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet004\services\avgArDisk
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet004\services\avgArDisk\Enum
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\avgArDisk
Now reboot, once the system comes back up you can safely delete the dreded avgArDisk.sys file without consequence.
As noted in my previous post, I had already uninstalled AVG and used their removal and clear tool but still had remenance of the program including avgArDisk.sys. What you may not know is that avgArDisk.sys isn't the only driver they install, here's a list of the others
avgArPot.sys
avgbidsdriver.sys
avgbidsh.sys
avgBoot.exe
avgbuniv.sys
avgKbd.sys
avgMonFlt.sys
avgRdr2.sys
avgRvrt.sys
avgSnx.sys
avgSP.sys
avgStm.sys
avgVmm.sys
I will be proceeding to remove them as well using the method described above, you'll have to find their keys first and a sweet piece of software to do that is Resplendent Registrar Lite, it has a nifty search function that brings back all occurrances of your search criteria so you can copy the keys from one window, it's free for home use.
Yep, no more AVG for me :-) It's a virus folks
I've got the same issue, win 7 32 bit, wont boot at all, safe mode cmd prompt fails at loading avgardisk.sys, usual windows repir tricks wont work, is there an actual fix for this apart from re installing the OS?
THIS IS NOT AN ANSWER
avgArDisk.sys has stopped my laptop from working properly. I have been coming back for days after repeatedly asking for help to remedy the problem with avgArDisk.sys
Hi there.
5th December 2019
Windows updated today however nothing changes as regards me not being able to get 'on' my laptop as I have always done by entering my correct password and logging into Windows.
Windows 7 Home Premium
Service Pack 1
Hewlett-Packard
HP G56 Notebook PC
Pentium (R) Dual-Core CPU T4500 @ 2.30GHz 2.29 GHz
RAM: 4.00GB
64-bit Operating System
Please can someone reply as occasionally having access via Safe Mode every now and then because of avgArDisk.sys will not permit me to run any other modes, to fix the problem that is that same file avgArDisk.sys, is an irony that wore instantly thin when I lost proper access to my laptop.
I have accidentally posted this matter as an answer on another thread.
It had been days since avgArDisk.sys completely messed up me being able to use my laptop.
In Safe Mode (and No other version of Safe Mode), after getting 'stuck' (hangs) @ avgArDisk…sys for a while, the windows login in page appears. I can type in my password and it is recognised and allows me to login in Windows.
I cannot do that on any Safe Mode option, ie networking etc because the system gets to avgArDisk.sys and just hangs then restarts.
When the laptop starts normally and the Windows 7 login page appears and I put in my correct password it says the my User Interface does not recognise me. Nb: This self password is used in Safe Mode and allows me to login Windows 7
This is a much reported problem since at least April 2019 here and before that in Windows forums.
I simply want to get proper access to my laptop before avgArDisk.sys changed all that.
Please reply.
I don't have a Windows 7 disk. Safe Mode in essence just let's me on.
Please reply with a right and proper solution/patch for the commonly occurring error.
Thanks
AGAIN THIS IS NOT AN ANSWER
*** I NEED URGENT HELP ***
AVGARDISK.SYS WILL NOT ALLOW MY LAPTOP TO RUN PROPERLY.
I HAVE NOT HAD PROPER ACCESS FOR DAYS
PLEASE REPLY
PLEASE CAN SOME ONE REPLY
This issue is devasting, got this error yesterday, still trying to figure out how to get control of my mchine. unfortunate part is that I can't access windows files through external drive encloser - I tried to change permission, unhide all files, still cannot access certain drives (windows files) within the hardsdrive and re-installing OS is not an option as I have critical data which I'm not willling to loose. this is bad, I think AVG must go to the drawaing board on this one, it's actually a virus.
I am having the same problem today. PC wont boot normally, just sits in windows logo.
Rebooted in safe mode and it gets as far as loading avgArDisk.sys then stops and hangs. As it wont complete booting in safe mode I cant revmoe avg so im stuck.
However, i disconnected my second hard disk and now it boots aok. So avgArDisk.sys is having problems talking to my 2nd disk preventing boot. Is it running some scan on it or something ?
I can see my second disk in the bios so its ok. once booted on single disk if I plug in my second disk and do scan for new HW in device manager I can see my second disk fine, its working and all data is there.
so what on earth is avgArDisk.sys doing at boot with my second disk to stop it booting normally AND not booting in safe mode ? An update to AVG virus definitions did indeed happen yesterday which I think caused this. I dont know if the software also updated. I use the basic free version of Avg.
I got this same issue today (Windows 7, HP notebook).
how do I launch the Regassassin if my PC doesn't boot?
Do I need to remove the HDD from my laptop, connect it to another computer and run Regassassin there?
I've a customer with same problem and I've been trying to solve it for a long.
I've tryed the solution proposed by Shawn Engleman and it doesn't work either. I've even tried a mix of this solution with Mike Sickinger's by removing the keys recommended by his program, also without success.
Obviously not being able to load Windows in any way I resorted to editing the registry offline (using an installation DVD following one of the ways explained in How to edit & modify the Windows Registry OFFLINE - WinTips.org).
I definitely surrender and will be forced to reinstall Windows.I am disappointed with AVG and will be warning all my customers to stop using it. 