I'm glad you had success with this. It's scary to think that your firewall and antivirus software can't stop these IRQ_HOOK trojans. But that's the point of them, to fly under the radar and locate themselves hidden in the processes of a program so that they go unnoticed. I'm not sure the intent of the trojan. What was it doing?
I'm really disappointed in the major antivirus software companies, i.e. Norton and McAfee. On the flipside I'm really impressed by the freeware companies who care enough to make their hard work and efforts free to anybody who needs it. Really impressed by these companies.
rkill.exe from bleepingcomputer.com
TDSS killer from support.kaspersky.com
Malwarebyte from filehippo.com/download
And Xpuser4real for posting the the fix. http://www.computing.net/answers/security/irp-hook
artymax - YOU ARE THE MAN!!!!! (or woman, don't know, but you get the idea).
Thank you - I've wasted two freeken days trying to figure out this problem. Your solution works!
My problem was exactly as you described - BSOD with 0x00000050 stop error, occured only when starting autodesk product, all other programs worked fine.
I followed the instructions posted by artymax above (run AVG Free, then three more steps). PROBLEM SOLVED!