Why are Source games running 30-50 fps better on Windows XP than Windows 7?

Solution
If its windows 7 x64 it will be the slight performance drop with using WoW64 to run the 32 bit game on 64 bit is considering on most source games you can get into the hundreds for fps even on low end cards.

AMDRadeonHD

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Jan 10, 2013
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They are not, everything is fully updated and cleaned. I was updating all the drivers and defragmented, just like on Windows 7, but Source games are running 30-50 frames per second better, especially Counter-Strike: Source (From 132 to189) on Windows XP.