How to Repair Your Currupted Windows XP and Windows 7

How do you perform a reinstallation of Windows XP, sometimes called a repair installation?

Configure your computer to start from the CD-ROM drive.For this firstly you have to press DEL when you start your computer.Then you will see BIOS blue screen where you have to enable 1st boot device to CD-Rom & 2nd boot device to Hard-Disk.
After that press F10/save it, & restart your computer.

Then insert your Windows XP Setup CD, and restart your computer.
When the Press any key to boot from CD message is displayed on your screen, press a key to start your computer from the Windows XP CD.
Press ENTER when you see the message To setup Windows XP now, and then press ENTER displayed on the Welcome to Setup screen.
[ Do not choose the option to press R to use the Recovery Console ]

In the Windows XP Licensing Agreement, press F8 to agree to the license agreement. Make sure that your current installation of Windows XP is selected in the box, and then press R to repair Windows XP.
Follow the instructions on the screen to complete Setup.

ADVANTAGES :

1. Your computer's performance will be fast.
2. Many junk files will be removed from your C: drive or default drive.
3. Broken or removed files will be fixed.