If your Windows 7 happens to be stuck in Startup Repair, where allowing it to repair your computer still results in going back to Startup Repair, and restoring a restore point doesn't help either, you could try to manually restore the Windows Registry to the last known good configuration.

Allow your computer to boot into Startup Repair, but rather than letting it perform the automatic repairs, click to go to the System Recovery Options menu. From there, you can open a command prompt.

Locate the system drive: this is usually the C: drive, but if not, navigate to other drivers and look for folders like Program Files, Users and Windows.

Once you've found the correct drive, navigate to the fo  ...