Windows 7 vs. Windows Vista vs. Windows XP

[Yuhaney]

Windows XP Professional x64 Edition

That's the best Windows ever!
Well you couldn't use DirectX 10 or 11, but all the games are compatible with DirectX 9.

You can use DirectX 10 on Windows XP.
Though that needs a certain patching...

Problem with it is, that Windows XP isn't made to use DX10, so it's very heavy when it's using it. But it works...

You can Google it if you want more info.