Method 1: If You Are Able to Run Windows

• 1). With Windows running, insert the Windows CD or OEM recovery CD into your optical drive.
  
  
• 2). Click the "Start" button, and then select "Run."
  
  
• 3). Type the following command in the "Run" box (X is the letter of your CD/DVD drive; check your system to find the proper drive number):
  
  expand X:\i386\rundll32.ex_ c:\windows\system32\rundll32.exe
  
  
• 4). Reboot the computer. Your corrupted rundll32.exe file has been replaced with the original.
  
  

Method 2: If You Are Unable to Run Windows

• 1). Insert the Windows CD in your computer's optical drive. Reboot the computer.
  
  
• 2). Upon restart, you may be prompted to "Press any key to boot from CD/DVD." Follow these instructions to boot from the Windows CD.
  
  
• 3). You will see a "Welcome to Setup" screen, which presents you with a few options: "To setup Windows XP now, press ENTER," and "To repair a Windows XP installation using Recovery Console, press R." Even though you are performing a repair installation, do NOT press "R." Press "Enter."
  
  
• 4). Select the Windows installation you want to repair from the list that appears. Look for C:\WINDOWS "Microsoft Windows ...". Then press "R" to enter repair mode. Press "F8" to accept the Windows licensing agreement.
  
  
• 5). Windows will reinstall the operating system, overwriting your corrupt or missing rundll32.exe file. Your other data and files will not be erased.