Forum:Help Pleeeeeeeeze

Hi All Im at my wits end i have installed and re installed New Vegas 4 times now and still have the same issue of whenever i start the game my computer goes back to the desk top every few seconds.i get maybe 6 secs of gameplay then i get the desk top then when i click on the icon to return to the game i have to click continue then the cycle repeats itself after a few secs of game play. I have Fallout 3 installed and have had no issues with that game. I am using a Sony Vaio VGN-FE31M with a NVIDIA GeFORCE Go7600 with 128mb/Mo dedicated VRAM and am using Windows XP. Any help would be gratefully recieved. Schiehallion