Im gonna stick with xp or windows server 2003. Win2k3 is faster and more stable than xp, which is why microsoft chose to base vista on it.
If its the skin you like then just get a transformation pack.
see:
Uh. Youre probably thinking of 64bit cpus. A 64-bit operating system can only execute 64 bit instructions. Which is why theres barely any drivers and apps for winxp 64bit edition.
Look on microsofts website. They have a tool that tells you just that.
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All 64 bit CPUs have support for virtualizing 32 bits, so the only disadvantage to using a 32 bit program on a 64bit CPU is that you wont be able to access more than 4GB of memory.