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
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?
Thank you for informing about Hiren's Boot CD.
It is not advisable to install the old version of AVG over the new one.
Will it be possible to remove all the files and folders related to AVG and then check whether you are able to boot into Windows?
Hi Peter,
We'll certainly check on this.
May I ask from when are you experiencing this issue?
Have you tried rebooting your PC in safe mode with networking?
Please take a picture of the error message while loading to check further.
You can post the image here in your topic. Click on "Answer" & then click on the "Image" [mountain symbol] & follow the instructions.
Hi everyone.
We tried to induce the issue reported and unfortunately, we couldn't see the same behavior. I would request you to update the AVG version to 19.5 and check if the issue appears again.
I would also like to understand the purpose of renaming the file avgardisk.sys. Awaiting for your response.
Tengo el mismo problema. Mi windows 7 no arranca. 
He probado de todo ya. Solo me queda formatear.
Hello everyone,
Don't reinstall your Windows before trying this out. It worked for me so it might work for you too.
Please watch this youtube video https://youtu.be/UGkLxry9_Gs
My Windows laptop used to hang while trying to load the file avgardisk.sys.
I tried everything… Normal boot, safe mode, repair option, system restore option. None of them worked. Finally I found this video and followed the steps.
I copied the avgardisk.sys file from c:\program files\AVG\ ==> to ==> c:\windows\system32\drivers. Rebooted my laptop and it booted straight into windows.
Tengo el mismo problema. Mi windows 7 no arranca.
He probado de todo ya. Solo me queda formatear.
I am experiencing the same problem reported by Ron Newfield. A power outage caused my computer to shutdown hard. When I restarted it, I received a BSOD, so I tried booting it into safe mode. When safe mode reached avgArDisk.sys it blue screened. Sysem Restore Point won't recover it either.
This is BS. I try system restore and oh what a surprise, the problem comes from Avast. I can't restore because of the same problem.
so right now I have no access to a laptop with a lot of important information and memories. Thanks for not checking out your updates well. You created a virus and crushed us all.
Ditto! Same problem for me, Can't find a solution other than a full re-install on my raid drive. Kind of upsetting. Will be taking my free version of AVG off of my machine and reporting this issue to anyone who has AVG immediately. I have been working as a PC Tech for over 30 years and I have never seen anything as disgusting as this. It's bad enough you guys created this issue to begin with but your "solutions" up to this point make me question your knowledge of computers in general. Not impressed!