the repair disc option from the install DVD? See here on how:
http://www.howtogeek.com/howto/5409/create-a-system-repair-disc-in-windows-7/
If the disc was not made, either make one from a fiends install or download and then make it into a CD. Google for the download.
I have windows 7 installed. but now the Windows Boot Manager doesn't appear and my computer loads into the windows xp setup, which leads to an error message, and then it restarts. I am locked out of a way to get into windows 7.
If I can get into Windows 7, I can get the Boot Manager back.
Does anyone have a solution? I do have my Windows 7 install DVD.
Thank You!

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