How to install Windows 7 on a HD with vista running on it

I bought myself a new computer, but i kept the HD of my old one, I don't have the computer yet, but i want to be prepared to install everything^^,

So here's my question: How do I install windows 7 on a Hard drive with vista running on it?

Will this cause problems or do i just have to insert the windows 7 disc and format the hard drive?

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