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I'm unable to boot one of my computers in any mode, including safe mode. I've heard you can use "Startup Repair" in situations like this. How do you get to Startup Repair, though?
If a startup problem is detected, Startup Repair will start automatically and try to fix the problem.
If the problem is severe enough that Startup Repair doesn't start on its own and you can't access the System Recovery Options menu on your computer's hard disk, you can get to the menu and start Startup Repair by using the Windows installation disc or a system repair disc that you created earlier. For more information, see What are the system recovery options in Windows 7?
For Windows Vista