I use Windows XP, since most programs I use can only be used with it - I do plan to somehow splice my computer so it can also use Linux sometime in the future, though. Just as well I have plenty of anti-spyware, anti-virus and a firewall to hand, since Microsoft is a target for most malware.
I don't know much about Vista right now, but I'll only switch to it if it doesn't make any of my current software obsolete. Backwards-compatibility is a must
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"For, lo! I am the vampire Evangeline...The "Dark Angel"!! Look upon my magicks, ye mighty, and despair...!!" - Evangeline A K McDowell, "Negima!" Vol 6
Also member of Naru Brigade, Leader of Great House Kanako, Nyamo's Brigade of Tanned Cuties, Asuna Brigade, Ayaka Brigade, Tsukuyomi Brigade, Ar Tonelico Melody of Elemia Brigade