computer hangs when i see online live video from net or through videoviewer software installed for 4 channel avtech dvr to see cctv live.i have 2* 500gb seagate hard disc installed in my system
type "reliability"in the run box and check your errors.
also check event monitor for errors, that might help identify the issue, sounds like your video driver/software is the issue..however it could be overheating, memory or a host of over issues,
check your temps with speedfan, and do a memtest.i hate computers!
but cant help myself....