Windows 7 Repair startup issues

Repair startup issues
Put the Windows 7 installation disc in the disc drive, and then start your computer.
Press a key when you are prompted.
Select a language, a time, a currency, a keyboard or an input method, and then click Next.
Click Repair your computer.
Click the operating system that you want to repair, and then click Next.
In the System Recovery Options dialog box, click Command Prompt.
Type (these commands are safe - more information)
Code:
Bootrec.exe /FixMbr
Code:
Bootrec.exe /FixBoot
Code:
Bootrec.exe /RebuildBcd
Press ENTER after each command.
Restart your computer.

That should do the trick! However if you still can't start Windows, then follow step 1 to 6 again and type this command (more information about this command):
Code:
Bootsect.exe /nt60 all /force
Press ENTER and restart your computer.