Did you think what steps are to be followed for how to run a startup repair in Windows 7 so here is the steps:-
1. Insert a bootbale Disk and boot to System Recovery Options screen.
2. Select the Startup Repair option.
3. Startup Repair will now scan your computer to attempt to find and fix any startup problems.
4. If problems cannot be found, then click on Next.
5. Click on the Restart button to return to the Windows 7 logon screen.