Ok here goes, before this problem my computer crashed and gave me a blue screen telling me something about nvdlmkm or something alike. Which was something from nvidia obviously, installed the latest beta driver and SP1 for vista 64bit. And this solved the problem. However since i solved that problem i got a new one. Which gives me a black screen nothing blue just black. Usually this is when it appears the video card is being used more then normal. Either playing a movie or something, or once in a while when i play a game on it. This does not happen immediately but after a while. Since this time its a black screen no error given like on a blue screen i am clueless one were to start to solve the problem. This did not happen when i had the blue screen crash. Does anybody have a idea?

Remove the latest "beta" driver & install the most recent -- public release -- driver for your card. http://www.nvidia.com/Download/inde...

thats the one i had installed which gave me a blue screen with the error nvlddmkm

Who knows .... it may have become corrupted. Uninstall your current driver, download & run Driver Cleaner. Then download & reinstall the latest driver again.

ok thanks, going to give it a try