BSOD Playing Counter Strike 1.6, Sometimes Random Or In XBMC?

Sometimes I get random BSOD's, it's not something that happens every day however it's getting irritating. The last time it happend was today in Counter Strike 1.6 with the "SYSTEM_SERVICE_EXCEPTION" error. So I followed your Verifier Driver tutorial and got 2 BSOD's with IRQL_NOT_LESS_OR_EQUAL caused by aswTdi.sys (Avast Driver).. However I just installed Avast yesterday, and as you can see in my dmp files, I have had BSODs before with SYSTEM_SERVICE_EXCEPTION and others, so I don't think that's the main issue.Sometimes I also get BSOD while watching a movie or something with XBMC, it happens randomly, but not often.I have thought maybe it's the ATi/AMD GPU (some BSOD ref.), and I have been checking temps, it's about 60C - I have changed the thermal paste and cleaned it - but still sometimes BSOD. I have played a lot of BF3 without getting BSOD, and that's a heck a lot of more strain on the GPU than CS 1.6.

My own guess is the GPU drivers, but I have been updating regularly Btw the System Health Report says "Atheros AR9285 Wireless Network Adapter" is disabled, and that's true, I have disabled it.System Info:Windows 7 X64 Enterprise Install date: 28-08-2011Intel Core i5 2500kZotac Z68 ITX2x 4GB Corsair Vengeance DDR3 RAMClub 3D Radeon HD4980System Disk: Crucial m4 128GBStorage: 2x500GB WD, 1TB WD - 7200rpmThe hardware is from august 2011, except for SSD (june 2011), storage (2009,2010) and GPU (2009).