First, I am assuming that you have created a 'rescue disk' on suitable media (typically a USB drive, or possibly 1 or 2 DVD disks), or you have the original installation disk(s). If so, you should be able to simply format c:, you will be advised this will destroy all existing data. Head the warning, if you have any files that are not suitably backed up, they will be gone.
Once the format is complete, insert your restore disk or the original disk, and reboot the computer. At this point, you will need to follow on screen instructions.
Now here is the potential gotcha, Microsoft has discontinued support for W7, so you may not be able to to update your original install disk, or your restore disk to the last version of W7.
If you are still uncomfortable, contact villages computer club, they should have someone that can help for much lower cost than geek squad, if GS will even work on a W7 system.
Hope this helps.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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