Michael,
Thank you for sharing the screenshot. I have sent you an email requesting the diagnostic information to analyze your issue and provide you with a resolution. Please check your inbox and spam box as well and send the requested the data to assist you further.
Hello James,
I understand the inconvenience.
I have checked the case record and found the troubleshooting that was followed by our remote technician.
In this case, it is necessary for us to collect and analyze the log files of AVG.
An email instruction has been sent to collect and send us the log files.
If the email is not found in inbox do check in spam and junk folders.
I have already recognized your issue which is related to the stream.sys file (https://unfitpc.com/stream-sys) , If you really want to overcome such a error then it is mandatory that you have to completely scan your system
James,
I understand the inconvenience,
Please start a Live Chat Session with our Chat Team and they will help you with the issue. Here is a link to start a Live Chat Session : http://avgclick.me/AVGtechnical
Hello Michael,
I'm sorry to hear about this, please let us know which AVG program you have installed on your computer (AVG Free Antivirus, AVG Antivirus business Editions or AVG Internet Security). Also please share a screenshot of the error message (blue screen) to assist you further. You can check the following link to see the instructions about taking the screenshot (http://support.avg.com/SupportArticleView?urlname=How-to-create-a-screenshot).
Best regards,
Alok.
I've been getting a blue screen with AVG free when I run whocrashed it states that avgstm.sys stream filter is the cause this is with the latest update applied I've tried reinstalling but gives the same problems, this tends to happen when browsing eBay, to get around this I've disabled web protection at the moment.
Michael,
Thank you for sharing the screenshot. I have sent you an email requesting the diagnostic information to analyze your issue and provide you with a resolution. Please check your inbox and spam box as well and send the requested the data to assist you further.
On Fri 10/27/2017 10:41:23 PM your computer crashed
crash dump file: C:\WINDOWS\memory.dmp
This was probably caused by the following module: avgstm.sys (avgStm+0xBA74)
Bugcheck code: 0x3B (0xC0000005, 0xFFFFF804AE1B0928, 0xFFFFB900F2726B40, 0x0)
Error: SYSTEM_SERVICE_EXCEPTION
file path: C:\WINDOWS\system32\drivers\avgstm.sys
product: AVG Internet Security System
company: AVG Technologies CZ, s.r.o.
description: Stream Filter
Bug check description: This indicates that an exception happened while executing a routine that transitions from non-privileged code to privileged code.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
A third party driver was identified as the probable root cause of this system error. It is suggested you look for an update for the following driver: avgstm.sys (Stream Filter, AVG Technologies CZ, s.r.o.).
Google query: AVG Technologies CZ, s.r.o. SYSTEM_SERVICE_EXCEPTION
Hi, I've had the Live Chat nowand Thought I was ok, but avgstm.sys has caused yet another freexe of my system and I had to power off. The Live Chat person just cleared the files in the temp directories. Seems it isn't as easy as that. 
Michael, For your info, just in case that you are unaware, you can post the screenshot here in your topic. Click on 'Answer' & then click on the 'Image' [mountain symbol] & follow the instructions.
AVG Guru
Hello Avinash, I am having the same problem since August. I have uninstalled my AVG Internet Security, used the AVG removal tool ver 1.0.1.5, and then re-installed, but I am still having my system freeze and then a new minidump generates showing that avgstm.sys caused the issue.
On Thu 10/26/2017 7:07:32 PM your computer crashed
crash dump file: C:\WINDOWS\memory.dmp
This was probably caused by the following module: avgstm.sys (avgStm+0xBA74)
Bugcheck code: 0x3B (0xC0000005, 0xFFFFF8070CEB0928, 0xFFFFBD80B7004B40, 0x0)
Hello Michael,
I'm sorry to hear about this, please let us know which AVG program you have installed on your computer (AVG Free Antivirus, AVG Antivirus business Editions or AVG Internet Security). Also please share a screenshot of the error message (blue screen) to assist you further. You can check the following link to see the instructions about taking the screenshot (http://support.avg.com/SupportArticleView?urlname=How-to-create-a-screenshot).
Best regards,
Alok.