http://www.planetamd64.com/ is a good source for all things to do with Windows 64-bit.

And, of course, I agree with svdl and XENOPHONZ on how to get the drivers and have them ready for install.  Hopefully HP isn't using hardware that doesn't have 64-bit drivers.  It is best to build your computer around the existence of such drivers as hardware manufacturers seem rather reluctant to support 64-bit systems even at this late stage.

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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