Try this 1.
1) Place the Windows 7 disc in the drive and boot from it.
When "Press any key to boot from the Windows 7 installation DVD" appears,
press any key to start booting from installation disc.
Note: If you failed to boot from the installation disc then make sure first boot
device is set as CD\DVD Drive.
2) When the language preference appears, click on Next.
3) When "Install Now" appears --> Click on "Repair your computer" found at the
4) Click on "Next" --> Select the option "Use recovery tools that can fix problems
starting Windows" and click on "Next" --> When "System Recovery Options"
appear --> Select the option "Startup Repair".
If the problem still exists, follow the above steps again and this time select the
option "System Restore" and follow the instructions.