Wierd PC restart Problem

I’ve been having this really wierd restart problem with the PC.
My Pc just restarts any time I try to play a Flash video like Youtube , Facebook , dailymotion and other stuff , any ideas why this is happening??
Answer #1
try uninstalling and reinstalling flash
might also be a browser or video driver issue
Answer #2
It was a flash problem that was fixed, however sometimes its still present even after updating.
Uninstall flash and run CCleaner, then reinstall the latest version. If this doesnt work your best bet is just to backup and reinstall windows, If your on XP a reinstall over the top will do the trick
Answer #3
ok this an old topic now , but the problem still persists… i tried it on multiple browsers , reinstalling XP , reinstalling flash , didnt work
now a BSOD comes , and the file mentioned is “ativvaxx.dll” , wat should i do?? I have Palit Radeon HD 4850 my grafix card