Windows vista/ win7 upgrade clean install

Hey guys, On my old pc I have Windows 7 which I upgraded from windows Vista. I no longer have the vista disk(I think). Is there anyway to wipe and reinstall win7 with the upgrade disk? Or any other way I can do a clean install without buying a new copy of win7?(Legally plz :D)

Edit: The reason I am doing this is I might give it to a friend once I get my new build in a month or 2
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More about windows vista win7 upgrade clean install
  1. put the disk in. select boot from DVD. Install it
  2. unksol said:
    put the disk in. select boot from DVD. Install it

    So you can install win7 from an upgrade version?!
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