Cannot display 1080p via vga to pt-ae2000u projector

Hello everyone. I hope the category is correct.

On my dual boot XP/Vista machine, I'm having problems displaying 1080P in Vista via VGA to a PT-AE2000U Projector. On XP, I can only display 1080i @ 30Hz. On my Vista, I can't correctly display any 1080 video. On both XP and Vista, 1080P displays crisp but it's horizontally smashed to almost a 4:3 ratio. On XP, 1080i looks good but I can sort of tell it's interlaced. This maybe the combination that it's interlaced and @ 30Hz. On Vista, I tried 1080i @ 30Hz, 1080i @ 60Hz, 1080P @ 30Hz and 1080P @ 60Hz and none will work correctly. I recentally installed Windows Media Center and it displays 1080P but it's stretched and I have to move the mouse to the left or right to see the rest of the screen. My projector does support full 1080P up to 60Hz. I'm sure this is a problem with my PC so maybe I'm in the wrong place but I've been working on this issue for a while now and I am desprate.

Has anyone had this problem or know how to fix it? Does this have anything to do with my motherboard not being HTPC compliant? I'm not trying to play Blu-Ray disks, I just want to display video in 1080P. I've tried to uninstall and reinstall the video card drivers/software with the latest. I've tried a new VGA cable.

Any help/info is appericated ladies and gents....

My PC Spec's are:

Mobo: Gigabyte GA-N680ISLI-DQ6
Processor: Intel Dual Core Duo e6700
memory: 2GB RAM in Dual Channel Mode
Video: 8800GTS 512 G92
Sound: Turtle Beach Catalina
500 Watt Power Supply
Display: Panasonic PT-AE2000U

Even though XP Pro will do 1080i? And Media Center will do 1080P stretched?

Ok. Thank you for your help.