Computer step by step
 Make your Pc better
Please provide your installation cd
If you don`t have your installation cd, move down the window that will ask for the cd and click Cancel first
on windows verification window
Confirm that you want to cancel the operation
In the Command Prompt window please select, copy and paste the following command:

sfc /scannow

Please press Enter to execute

Note: This command, depending of your operating system, will ask for windows installation cd.
Write cmd and press ok
This method shows you how to verify Windows Xp Integrity using Command Prompt
Please perform the following steps:

Please go to Start and choose Run ...
Windows Integrity
Windows Vista Windows 7 Windows Xp CMD Back Up Back