Do you have the original activation key?
If so, you can download the official Windows 7 ISO, reinstall (blowing everything away), and activate using your activation key.
Download your Windows 7 ISO here:http://www.w7forums.com/threads/official-windows-7-sp1-iso-image-downloads.12325/
But....who is "Pro Techs", and why are they connecting via remote? There have been several scams that do exactly this.