New build problem

ok so ive build my computer fine and i have a previous OS installed on the hard drive. I was wondering is there a way to install a clean copy of windows 7 with out the cd rom. I do not have the cd rom yet. I have the windows 7 upgrade cd key and i have the files, I can run it but it doesnt say a clean install it says that the old files will be put into a folder called old. I want a fresh install and everything deleted that is old. Curiosu how i can do this?
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  1. Best answer
    Um, you need the installation disk in some bootable format for a clean install.

    Either dvd or USB key.

    Only alternative is to just copy an image from another source onto your HD.
  2. Best answer selected by k1ngkev1n1.
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