Lately it seems that my one year old computer will chug along just fine for several hours, sometimes longer, sometimes shorter. Suddenly everything will just freeze -- the mouse, the keyboard, even the reset button doesn't work.
Someone suggested that this is probably a hardware problem. I run virus scans regularly, so I think that it probably isn't that.
JavaBeginnersFaq "Yesterday is history, tomorrow is a mystery, and today is a gift; that's why they call it the present." Eleanor Roosevelt
What are you doing when the computer freezes? I had that problem with one of my boxes and it turned out to be a video card that was overheating... Everything would run fine until I started up a game or something, and then it would run for about 5 minutes and lock up. When I rebooted I got all kinds of freaky windows errors unless I waited 5 minutes for the card to cool down. Finally it started freezing about 5 minutes after any graphics were on the screen... even the windows desktop! So right now I am running Linux in text mode on it until I decide what new video card I want to buy...
In the past I have also had intermittent lockups due to bad memory... that's a little harder to troubleshoot without extra memory lying around...
Write once, run anywhere, because there's nowhere to hide! - /. A.C.