Windows 7 Launching Problem....Help!

I downloaded windows 7 from the microsoft web site. The download completed fully and now I'm trying to launch windows 7. I click on the "launch" button in the "Windows 7 Download Center" screen and nothing happens. I'm sure there are several other steps included in order to get windows 7 running, I just don't know them. I'm running windows xp on an HP pavilion I bought new in '04. If anyone could help me I'd appreciate it. Thanks

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