Hello there.
I got this problem where my screen turns into a random solid colour, making me unable to do anything and forcing me to manually turn off my pc. This is a really annoying problem since it leaves me unable to play ca. 30% of all games i install since it either crashes at the logo/loading intro or the main menu. 80% of the games i play will/does at some point crash. I have done alot of testing with these crashes, and it almost never happen when im in the middle of the action. It commonly happens at loading screens and menues, and to be even more specific right before or after a match. I have found out that i can prevent this 99% of the time by minimizing the game, though as soon as i pop it up again the risk of crashing reappears. The only exeption (99%) is if it crashes right when it starts up (This only occurs with one game yet) wich gives me no time to minimize. Youtube is also an important thing to mention. If i watch a youtube video in fullscreen mode, or watch 2 videos at once (Not nececarily in fullscreen) theres a big chance of my computer crashing (I got no % on it at this point) I use a 32. bit vista. I have checked for old drivers and they are all up to date.
This problem has been going on for right around 6 months now, but i have been too lazy to do something about it till now
I have seen other people with this problem before so i hope i might be able to find help on it here.
On advance thanks.

NVIDIA GeForce GTX 260.
The FurMark burn-in test: 10604 frames, 11 fps, 86 Celsius. Resolution: 1920x 1080. Cpu speed 2999 MHz. System memory 3325.

Sorry, i dont understand how to obtain "memtest86"

Downloaded it but im not able to open the file :S

Right around 1:42 he opens it. When i try to open it, it says that windows cannot open the file. Btw my english is ok, atleast my vocabulary is.