The Windows 7® installation disc comes with a "System Repair" tool that you can use to fix a number of startup errors that you may encounter while booting up Windows 7 on your computer.
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Switch on your computer and press the appropriate key (Usually it's F1, F2, F12, or Delete) to enter the BIOS setup.
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Change your first boot device priority to your optical drive (CD/DVD ROM). Insert the Windows 7 installation disc into the optical drive, and hit the F10 key (or the appropriate "Save and Exit" key) on your keyboard. This will save the BIOS settings and exit.
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Your computer will now restart and try to boot from the Windows 7 installation disc. Press any key on your keyboard when you see the following message
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Click the 'Next' button when you see the following screen.
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Click 'Repair your computer'.
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Be patient while the installer scans your hard drive for Windows® installations.
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Select the operating system labeled Windows 7 from the list, and hit the Next button.
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Select the Startup Repair option.
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The 'Startup Repair' tool will scan your PC and attempt to find and fix any problems that are preventing Windows from starting properly. This may take a few minutes. Please note that your computer may restart several times during this process. So sit back and relax!
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If the Startup Repair wizard detects any problems, you will be prompted to select the appropriate option. If the Startup Repair tool repairs your computer successfully, Windows will start correctly. If Windows does not detect any problems, you will see the following screen. Click the Finish button. Click the View diagnostic and repair details link if want to see a detailed summary of the scan and repair attempt.
Screenshots used with permission from Microsoft.
