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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?