1. Insert the Windows XP setup CD in the CD drive of your computer, and then restart your computer.
2. Press “R” on your keyboard when you see the Windows XP 'Welcome to Setup' screen. This will start the Windows XP recovery console. If you are asked to enter the administrator password, type it and press “Enter.”

3. Type the following commands one by one, without quotes, at the command prompt, and then press “Enter.”
“EXPAND drive_letter1:\i386\user32.dll_ drive_letter2\windows\system32”
“EXPAND drive_letter1:\i386\userinit.ex_ drive_letter2\windows\system32”
Replace drive_letter1 here with the CD drive letter of your computer in which the Windows XP setup CD is present (for example, E:), and drive_letter2 here with the letter of the drive in which Windows XP is installed on your computer (for example, D:).