I believe that your system, as is would run Vista, but if you built it just for DirectX 10 gaming you should add more memory. Vista(64bit) will benefit more from the added memory than XP(32bit). Run this program, Vista Upgrade Advisor
http://www.microsoft.com/windows/pro...deadvisor.mspx
Mike
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Speak kindly to me, beloved master. Revel in my unconditional love, and give me every minute that you can spare, for my time with you is short.
--Your faithful dog