well to be honest stay with xp or xp 64 if you have 64 bit cpu
i tested vista for 2 months and wasn'tt really happy older games not working good lots of crashes and copying files was horrible i heard vista sp1 solves allot of problems but still it reminds me of windows millenium but thats my opnion
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pc1:Q9450@Watercooled.Asus Rampage Formula X48.4Gb Mushkin redline pc8000.Gainward GTX260.Corsair Tx 750W.1Tb storage.Xfi extreme gamer
pc2:Q6600@Aircooled.Asus P35K SE/EPU.3Gb corsair pc6400.Gigabyte 8800GTX@Thermalright Hr03+.250Gb storage.Ocz Modstream 520W.Audigy 2 zs platinum