So first little story 1. Get ATI X800 card, use Windows XP Pro Sp2 eng, download ATI Catalyst 5.3 drivers w/o CCC component 2. Install them (e.g. update from 5.2 like dozen times before from older to newer drivers) ... 3. Restart 4. Display Properties > Settings > Advanced > Options (ATI icon by it) 5. Blue Screen of Death ok ... then i hunted what is causing it ... and i found that PG takes part in this bad event ) it's evident that ATI Control Panel (atiprbxx.exe) trying install service using rundll32.exe in very WEIRD way and this will cause whole machine to crash (PG enabled or PG in learning mode ... both cause disaster)... only way how prevent BSOD is to give rundll32.exe rights to Access Physical Memory ... very strange ... anyone got some comments on it ?