How to Repair Windows 7
Follow the Steps to repair Windows 7:
Insert Windows 7 DVD before Windows Logo Appears.
When Prompted with " Press any key to boot from cd" ; Press any key
After the files load, select the language then select "Repair Your Computer".
The Repair Environment will detect earlier installations of Windows 7.
Select the Installation you want to repair and select ok. Thats it you are done.