Installing XP 64 bit

[lackofgrip]

Every time I try to install Windows Pro 64 bit I get a blue screen, I was wondering why this is.

My Computer

Dell XPS 710
3GB Ram
nvidia 8800GTX sLI'D
Intel Core 2 Duo 6400 @ 2.13

Please help as I want to be able to use 4GB of ram which I purcahsed

 

[lackofgrip]

I've tried windows 7 but it doesn't let the Nvidia 8800GTX.

Meaning when I install the drivers and try using the Nvidia control panel there is no Sli function????

 

[lackofgrip]

I will reinstall win 7 and let you know