Why would you need to pay $200 for Windows 7 if it came on your PC? Just reinstall using the installer provided in Clean Reinstall - Factory OEM Windows 7
following the steps closely to get a perfect reinstall.
To get the cleanest slate for reinstall wipe the HD first with Diskpart Clean Command
accessing Command Line by pressing Shift + F10 after booted into the installer.
Please read the tutorials closely and ask back any questions as you had this information almost a day ago and could already be reinstalling had you payed attention and read the links.