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Windows 7: BSOD on boot, crashes at AVGIDSxx.sys, CLASSPNP.sys


14 Jan 2011   #1

Windows 7 x64 RTM
 
 
BSOD on boot, crashes at AVGIDSxx.sys, CLASSPNP.sys

I just upgraded my system from an old Q6600 to i7-2600K, replacing motherboard, CPU, CPU cooler, and RAM, and now my Windows 7 system won't boot. I get a BSOD after the Windows logo, general error message that says STOP: 0x0000007B. I then tried to boot into safe mode but it crashes loading AVGIDSxx.sys. Did some googling and found this seems to be a problem with AVG anti-virus, so I loaded my Windows 7 CD and tried to repair my Windows. That didn't work, so in recovery console I went to command prompt and renamed all files AVG*.sys files to AVG*.sys.old in C:\Windows\System32\Drivers as recommended on another forum. Upon rebooting, I still got a BSOD so tried again to go to safe mode and found now it is crashing at CLASSPNP.SYS. I tried to google that error but there seems to be many possible causes for that.

I've tried a bunch of different things, repair windows install from Win 7 CD several times, I also tried to repair/fix the MBR but I forget which command I used for that. I'm now running chkdsk /x on all partitions from the recovery console command prompt.

A bit more googling suggests both these system files causing crashing may be due to a virus or trojan. Any ideas?


My System SpecsSystem Spec
.

14 Jan 2011   #2

Windows 7 Professional x64
 
 

Hello,

It sounds like you may have a virus that is affecting many systems lately. Run the Kaspersky TDSSKILLER program: How to remove malware belonging to the family Rootkit.Win32.TDSS (aka Tidserv, TDSServ, Alureon)?

Download that to a CD or USB drive, and boot to a command prompt. Locate the file, and run it from there. If you have it on F:\Tools, enter f:\tools\tdsskiller.exe into the command prompt.

You can also try the manual bootrec commands. Enter these from a command prompt:
Code:
bootrec /fixboot
bootrec /fixmbr
bootrec /rebuildbcd
See if that works.

For info, your system is probably not crashing on CLASSPNP.SYS; that is the last driver that was loaded, and it is stuck on the next one.
My System SpecsSystem Spec
14 Jan 2011   #3

Windows 7 x64 RTM
 
 

Thanks I will give that a try. I knew I kept my netbook after getting an iPad for a reason!
My System SpecsSystem Spec
.


14 Jan 2011   #4

Windows 7 x64 RTM
 
 

Quote   Quote: Originally Posted by Jonathan_King View Post
Download that to a CD or USB drive, and boot to a command prompt. Locate the file, and run it from there. If you have it on F:\Tools, enter f:\tools\tdsskiller.exe into the command prompt.

You can also try the manual bootrec commands. Enter these from a command prompt:
Code:
bootrec /fixboot
bootrec /fixmbr
bootrec /rebuildbcd
See if that works.

For info, your system is probably not crashing on CLASSPNP.SYS; that is the last driver that was loaded, and it is stuck on the next one.
I cannot run the TDSSKILLER tool from my USB key as it does not work in a DOS environment. I tried formatting my USB key using a Windows ME boot disk tool, then booting with this key to run the tool. I also tried booting from my Windows 7 CD, attempt a repair install and then went to command prompt.

I also ran those three bootrec commands and they all said they ran successfully but I still get BSOD on boot. The /rebuildbcd command showed the following however:

Successfully scanned Windows installations
Total identified Windows installation: 0

I notice that the Windows 7 CD detects my windows directory on my hard drive's D:\ partition where before my hardware upgrade it was the C:\ partition. Now the C:\ partition appears to be the Windows 7 recovery partition, which was previously hidden. Maybe I need to run a partition manager? How else can I run that TDSSKILLER program?
My System SpecsSystem Spec
14 Jan 2011   #5

Windows 7 Professional x64
 
 

Mark your Windows partition as Active, and then run Startup repair.

Partition - Mark as Active
My System SpecsSystem Spec
14 Jan 2011   #6

Windows 7 x64 RTM
 
 

Thanks, I followed that link to re-set my Windows 7 partition as active, it now shows up as C:\ in startup repair. I'm still getting the BSOD on boot and I've run the startup repair a few times... I reran the bootrec commands and the last one still says 0 windows installations. Any more ideas?
My System SpecsSystem Spec
14 Jan 2011   #7

Windows 7 Professional x64
 
 

Download Ubuntu, boot it up, and select "Try Ubuntu". Backup your data, and then do a clean install.

Download | Ubuntu

Before you reinstall Windows, wipe the hard drive using Clean All. See here: Disk - Clean and Clean All with Diskpart Command
My System SpecsSystem Spec
15 Jan 2011   #8

Windows 7 x64 RTM
 
 

I SOLVED MY PROBLEM!!!! Turns out it was my new motherboard's SATA mode. It was set to default in AHCI mode, but my hard drives were formatted in IDE mode. Once I switched it to IDE mode I was able to boot into my new system!
My System SpecsSystem Spec
15 Jan 2011   #9

Windows 7 Professional x64
 
 

Good, good. Now you can use this guide and enable AHCI again: AHCI : Enable in Windows 7 / Vista

If you need anything else, don't hesitate to post a new thread.
My System SpecsSystem Spec
17 Jan 2011   #10

Windows 7 x64 RTM
 
 

Thanks worked like a charm!
My System SpecsSystem Spec
Reply

 BSOD on boot, crashes at AVGIDSxx.sys, CLASSPNP.sys




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