It's called reformatting, regardless of where you got your version of Windows.
The entire Windows NT line, at least since 4.0 and possibly before (this includes Windows 2000, XP, and Vista) has an option to partition and format hard drives during the install process. This, of course, assumes you're doing an ordinary Windows install. Some manufacturers ship a "restore CD (or DVD)" that has an image of your hard drive's original factory contents on it. This overwrites your hard drive with a byte-for-byte image of how it was originally configured. The procedure for reimaging like this varies from manufacturer to manufacturer. Generally, you boot off the recovery {C|DV}D and then it will walk you through a reimaging procedure.
If you do a google search you can find your windows key within the registry of your computer (assuming you haven't formatted it yet.) There are also several free programs that can recover it for you.
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The entire Windows NT line, at least since 4.0 and possibly before (this includes Windows 2000, XP, and Vista) has an option to partition and format hard drives during the install process. This, of course, assumes you're doing an ordinary Windows install. Some manufacturers ship a "restore CD (or DVD)" that has an image of your hard drive's original factory contents on it. This overwrites your hard drive with a byte-for-byte image of how it was originally configured. The procedure for reimaging like this varies from manufacturer to manufacturer. Generally, you boot off the recovery {C|DV}D and then it will walk you through a reimaging procedure.
Anyway, I can't find my Windows key, so I'm going to tear my room apart but I'm probably screwed.
I would pay if forward by sticking around and helping people, but I'm too stupid to help anyone so I'll just go away quietly.