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Once the boot loader has finished you will be presented with an MS-DOS window. Press “R” to access the recovery console. The program will scan for the install to repair. Once it has selected the version you want to repair, usually option 1, you can begin the repairs.
If you’re unsure of the commands available, type help, to view a display of them on screen.
My suggestion, when troubleshooting boot problems is to do these tests in order.
First type fixboot into the console. This will attempt to repair the boot record, which is a common problem with Windows.
Check the disk by typing chkdsk /p c: which will check your drive C: for problems. This is an exhaustive check and may take a while. You can use chkdsk to troubleshoot problems from within Windows, but the /p switch is only available from the recovery console.

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