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#11
Considering your win7's legality is questionable, you can try going back to Vista. You have the following options.
1) Download Vista repair disks (no these are NOT install disks), you can run various recovery options after booting from that disk. Its a ~120 mb download.
Windows Vista Recovery Disc Download — The NeoSmart Files
2) If you created recovery disks for the Vista oem install, boot from them and let them do their stuff. This will restore factory default state. You can also do this from the hidden recovery partition but depends on whether you deleted that during win7 install.
3) If you dont have a Vista install dvd, borrow one from a friend or download from a clean site. Then, activate by calling MS.