Re: windows xp 64 bit
First, I hope your system includes 64-bit drivers, because the 32-bit drivers will never work on a 64-bit OS. Ass for applications, they use what it's called a WOW64 to emulate 32-bit apps. It works and on some, it doesn't, but software giants, like Avant, VMWare, etc includes 64-bit applications.
Make sure your system has 64-bit drivers though...that's all you need really.