Graphics issue, FFXI in Windows XP x64Follow

I just did a big PC upgrade and moved from my old socket 754 motherboard to an Asus M2N-SLI Deluxe AM2 board with an AMD 64x2 6000+ and 4GB of RAM, I also carried over my EVGA 7900GT KO video card from my old setup.

I switched to windows XP x64 so that I would be able to use all 4GB of my new ram and installed the 64bit 169.17 drivers from the nvidia website. I kept my same 1600x1600 resolution for FFXI that I had been running for months without any problems on the old machine under windows XP.

So last night I got onto FFXI to mess around for a few hours and in that time my display completely glitched out three times. The entire screen would turn into multi-colored static and I couldn't see a thing. The game wouldn't crash, the sound continued to function and everything, and when I would close the game by typing /shutdown everything would be normal when FFXI closed and I was back at my desktop. I could then launch the game again and it would be fine for 30-40 mins and then glitch out again.

Any ideas? I've switched back to 32 bit XP for now so that I can play the game, but I'd like to go back to x64 if possible. Maybe I should try different drivers? Or maybe my video card has some compatibility issues with this combo of hardware, x64 and FFXI?

Kinda sucks to gimp my ram down to 3.5GB but FFXI is the game I spend the most time playing so I don't want it crashing all the time, but I'm not against the idea of trying an 8000 or 9000 series video card if it would fix the problem. Any advice is appreciated.

The driver I used is here: http://www.nzone.com/object/nzone_finalfantasyxi_downloads.html

I was thinking that except that the game runs ok for him in the 32 bit edition. If it were getting hot I would imagine it would be more consistent regardless of the OS, but maybe the 64bit does things to make the card heat up more than the 32bit does, I really don't know.

There's no other reason for me to run x64 than the RAM, and I can certainly live with the 3.5 GB that XP is able to access.

And I highly doubt it would be a heat issue, I have an Antec 900 case with 3 120mm fans and 1 200mm fan, along with a zalman cpu cooler, so everything runs very cool.

I think I might just set up dual boot, so I can run standard XP for FFXI, and play around with x64 too.

Yeah its a nice case, I like it. As far as the ram goes, I got it because it was cheap, Corsair XMS2 DDR2800 2GBx2 was only 79 bucks with a rebate, so I figured what the heck, why not? future proof it a little. I just got an XFX 8800GT 512MB video card too, I want to check out Crysis, hehe.