The usual are Flash and malware.
For Flash, google "Disable Flash Hardware Acceleration."
For manual try Grif's advice -> http://forums.cnet.com/7726-6132_102-5098912.html?tag=posts;msg5099421
If it's some hardware issue, then you have it fixed.
whenever i open my web browser it crashes my web browser randomly at any moment or it restarts my pc without reporting any error or sometimes turns to a blue screen with message...Help me...if u need anymore information regarding please let me know....situation is horrible...help!!!!!