STRANGE never seen problem with 7950gtx in 1710. Please help :(

Ok so i've got xps 1710 with 7950gtx, core 2 duo, 2gig ram 667mhz, 5400 rpm 160gb HD and a problem that I have no idea how to solve. This is regarding to the most important part of this laptop meaning GPU nvidia go 7950gtx. The problem is whenever I run the game 4 example Medal of Honor Airborne demo after few minutes of great quality and performance my screen turns black for a split second (it doesn't turn off the game[ refreshing??]) and after that game runs serveral times slover- I noticed that the processor speed in that split second goes down to 0 (normaly when running MoHA 97% usage) and goes right up to full usage. My guess would be that some kind of application is being turned on, but the strangest thing is when I alt-tab back to the game(from cpu graphs in wi) it runs smoothly for 20 seconds and the same problem happens over and over again. I didn't notice that split second screen in other games like Bioshock or BF 2142 but games dramatically slow down after a while. Accually the only game that runs smoothly is scarface but it doesn't have such HIend graphics. I have a winXp and after couple installations and unistallations of drivers from laptopvideo2go (the latest, and not) I come to the conclusion that its not the graphic drivers cause it happens in most of them.

Accually I notice that split second glith while using windows to but the screen doesnt turn black for a sec but kindof blury and goes back to normal. It doesnt happen that often though.

I used 3dmark06 to check the scores and it shows i get the same range as most of the XPS users. Around 5300 so looks like GPU performs normally.


Please guys help me out here and let me use my computer

Thanks a lot for all replies!