O've just got connected to the net(finally) and here's the first problem. Whenever I want to fullscreen a youtube video, firefox crashes and so does internet explorer. Every other site works just fine.
edit:nevermind. I've restarted the pc and it worked again. It's weird because i've restarted it several times...
It crashes because you have run out of cache memory, which is dedicated to video display. If you were to reduce the size of the display window, 1/2 screen or 3/4 screen it would use less resources, and would not crash. As soon as you exceed the allotted amount, say, 7/8 screen, then it will overflow and crash.
If you had more memory dedicated to video, say for example an external 500 mb PCI video card with separate GPU, and more cache in your main CPU, you would not have the problem.
It's video streaming or video games that uses too many resources, everything else works fine. This happens to gamers too.