Hard drives are dirt cheap and easy to replace. Windows 7 installation DVDs are available for download. You should have your systems key printed on a tag somewhere. (On mine, the tag is under the battery -- safe and secure, but who'd guess to look for it there?)
Cheers, PW.
P.S. Burn a Windows 7 DVD, boot from it, and test your system. There's no point in buying a new drive until you know that the other hardware is OK.
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