I'm using a couple month old HP laptop than came with Windows Vista SP1. I also use McAfee, Windows Firewall, AdAware, and Firefox.
The computer runs smoothly with no problems during use if I'm surfing the internet or working in Microsoft Office, but when I'm playing any form of multimedia (be it iTunes, YouTube, any flash game, etc.), the screen sometimes randomly goes completely black (multiple times a day), any sound coming from the speakers/headphones stops, and the computer doesn't seem to recognize any command I enter into the keyboard (FN+F3 usually puts it into sleep mode instantly, but that doesn't work, nor do any other commands I know). I'm forced to forcefully shut the computer down with the power button. The computer reboots fine, as it usually does when I shut it down that way.
I've run both McAfee and AdAware but neither come up with anything. Does anybody know why my computer does this or of a way I could figure it out?