I would think that the major limiting factor with your pc is the OS - try Win7 and I'm sure you'll find that it runs it a great deal better. Crysis 2 is not a good indicator as it uses DirectX 9, and therefore XP handles it OK.
Luthier has said elswhere (?) that most of the worst glitches are associated with DX9 - others using a GTX260 with Win7/Vista have not had these hassles. Oh, and you'll need more RAM, too.
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I'd rather be flying ...
Gigabyte 990FXA-UD5 | AMD FX-8350 | MSI HD7970 TFOC-BE | 8GB Corsair DDR-III 1866 | Win8.1 Pro 64-bit
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