Just find and run the Restore Point app in Win7. If you did not establish a restore point previously, it will erase most apps and revert to the last configuration, the out of the box configuration. I backed up my data first and reinstalled, so cannot remember if it erased it all or partially, but had to do it after a bad blue screen crash connecting to a public network, so I took no chances. I was backing up then anyway, though I had to do it under low res video and a weird color theme I could not reset.