reinstall win 7

Restore previous Windows version from Windows 7
this article will show you how to manually restore the previous windows operating system installation to replace the version of windows 7 operating system you are using by using the windows.old folder.
Instructions for reinstalling Windows 8.1 on the Surface Pro tablet
if you upgrade your surface pro tablet to windows 10 preview and the operating system fails, or simply you want to completely reinstall everything. in the article below, network administrator will guide you how to reinstall windows operating system on the surface pro tablet using usb recovery.