ASUS 8800GT in XP 64Bit

Perhaps that game has a 64-bit patch? I don't really know, but for game-specific issues, it's usually best to check with the game publisher or developer for support. It's their software, and as such, errors like the one you've encountered have likely occurred previously during internal testing.

Edited for rags... Better? I eliminated the reference to DX10... Nit-pickin sunnuva _____ you are, sometimes.

GEEZ

I dont have Vista 64.

You bought XP x64 after owning Vista x86? Odd.

Try a few other games to see if that one is the only issue.

Considering getting Windows 7 RC 64bit on May 5th when it's released to the public (for free). It'll be usable for at least six months maybe a year.

With 4GB of RAM and a 512MB video card your 32-bit system likely can access about 3.3GB of it. Sure you have XP-64 which should use 4GB fully but the difference in the RAM has no impact on a single game that I know of.

Crysis on your system likely would never use more than 1.3GB of your RAM for the game itself which still lives plenty of buffer room for Windows and other application components.

The 32-bit versus 64-bit use of 4GB has been well tested and the general consensus is any noticeable difference is minor, though if you surveyed knowledgeable computer people they'd probably tell you to choose Vista x32 over XP x64 every time.

So you own two operating systems for the same computer huh?

If you want to get crazy, partition your main hard drive and install both Win XP x64 and Vista x32 and compare the experience.

(FYI "x86" doesn't mean 32-bit. Technically it's x86_32 or x86_64. Why some people started saying x64 for 64-bit versus x86 for 32-bit I'll never know. x86 refers to the core CPU architecture which determines its Instruction Set for writing software. Apple used to use a PowerPC architecture but switched to x86. Anyway I'm sure you don't care...)