I found that if you disable "hardware accelerator" for flash based videos it helps a lot it the situations with online video play back.
Does it BSOD or just restart?
also make sure you disable automatic restart on system failure for when your away then if it does blue screen at least you have a jumping point. Just press F8 when the computer boots and at the screen where safe mode is you will see that option.
Actually after going through tons of trouble shooting I discovered one of my usb device's was causing the crash. in win xp the akai mpd 16 will crash any win xp comp. contacted there techs and trying to work it out