"The Advanced Boot Options screen lets you start Windows in advanced troubleshooting modes. You can access the menu by turning on your computer and pressing the F8 key before Windows starts (Tap F8 at the rate of about once per second)"
If that does not fix it, follow this method, as the inbuilt startup repair software may fail to fix it:
Make your own System Repair Disk from the information in this Tutorial:
"This will show you how to create a Windows 7 system repair disc to be able to use to boot to
system recovery options to help recover your Windows 7 installation if you don't have a Windows installation disc, can't find your Windows installation disc,
or can't access the recovery options provided by your computer manufacturer.
A system repair disc is not able to install Windows 7.
If you are unable to boot your Windows 7 to create a Windows 7 System Repair Disc, then you could create it on another computer to use on your computer."
Then use that Disk for the System Recovery Options: