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How to Repair a Corrupt Windows 7 Installation red this setap
Here's what How-To Geek says:
"If you’re having boot problems on your Windows PC, it’s often helpful to repair the MBR (Master Boot Record) to restore the Windows 7 boot loader—and you can do it easily from the Windows installation disc.
"If your PC starts booting into Windows but fails, you should probably try using Safe Mode instead.
"The first thing you’ll need to do is boot off the install disc, and then click through until you see the “Repair your computer” link in the lower left-hand corner."
From there they recommend clicking on Command Prompt and following instructions. Good luck.