Also have you tried uninstalling Steam deleting all of its files etc from the system
Download and install Steam
Also post the dump files
Download and run this application: BSOD_XP_v1.3_jcgriff2_PROD.exe.
Once it has finished running zip the folder TSF_XP_Support which can be found in your Documents folder.
Attach the zipped file to your next post.
Another problem, possibily linked with this is that Windows appears to be unable to boot occasionally at just continues loading at the XP logo screen for ages. I tired safe mode and it appeared to be hanging at AVGIDSEH.sys so I removed AVG and then it appeared to be hanging at mup.sys. I ran chkdsk /f and it said that it fixed one or more problems but the issue still remains. Once in every 5 or so attempts it boots fine. Very odd!
I just scanned with TDDSKiller and it found a rootkit! Rootkit.Boot.Pihar.a Could this be causing the BSOD's when opening Steam? Removed and restarted. I'll post back to let you know whether it has be solved.
Sorry to revive an old post. Just wanted to say for anyone else who had this issue. My dad was running Windows XP, same exact issue. Same exact fix. Used the same exact program (TDSS Killer). I also think it was the same exact bootkit. (It was a bootkit, not a rootkit) It all works great now!
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