My system has been experiencing crashes (almost daily) and mostly occur when viewing Flash videos such as ones on Hulu.com or videos playing using Microsoft Silverlight. The video will stop and after a few seconds the sounds will loop. The computer at this point has become completely unresponsive. The mouse cursor is frozen in place and the keyboard is useless, yet the hard drive light still flickers as though it is working. Also, sometimes but not always, the DVD Drive will be blinking and making noises as though it is attempting to read a disc that is not in the drive. At this time, all I can do is do a hard reboot of the machine.
I have tried several different browsers and have latest version of the Flash plugin installed. I have made sure that all my drivers, including my sound and video card, are up to date. I have run diagnostics and checks on the hard drive and memory. It all checks out fine. I am up to date on all of the current Microsoft Windows Updates. I have the latest Norton 360 virus protection and am sure that my computer is free of viruses and malware.
After each crash I have checked the event log and found that it had not recorded anything in "Critical", "Errors", or "Warnings" at the time of the crash.
At this point I am at a loss to discover the causes of these crashes. If anybody has any useful input, I would be very grateful...