Startup Repair, the first item on the System Recovery Options menu in Windows Recovery Environment, is designed to get you back up and running when Windows won’t start because of damage to (or deletion of) one or more essential system files. Generally speaking, if you’re not sure why Windows won’t start, you should begin your troubleshooting by running Startup Repair.(Under some circumstances and depending on how your system has been set up, Startup Repair might run automatically when Windows fails to boot.)
Startup Repair begins by displaying the following:
After a few moments, Startup Repair reports its results. This is not a promise that your system has been fixed—but it is encouraging. If you respond by clicking Finish (as you can see in the following figure), the system reboots. If no problems remain unsolved, you’ll be heading straight back into Windows. If more repair is needed, Startup Repair runs again.
Note If you want more information about what Startup Repair has done, click the link at the bottom of the dialog box—Click Here For Diagnostic And Repair Details.