How to Reinstall Rundll

1. Click on the 'Start' button and select 'Run.' Perform this step if you are able to boot into windows, which means you have the ability to replace your rundll32.exe using the 'Run' command.
2. Type the following in the 'Run' dialog box (Replace the X with the letter of your CD drive):expand X:\i386\rundll32.ex_ c:\windows\system32\rundll32.exe
3. Reboot the computer. The rundll32.exe file has been replaced.
4. Perform a repair install. You must do this if you are unable to boot into Windows. Insert the Windows or OEM system recovery into your CD drive. Restart the computer.
5. Press any key on the keyboard to boot from the CD, when prompted.
6. Press 'Enter' to begin the repair process when you see the 'Welcome to Setup' screen. Do not press R.
7. Select the installation you want to repair from the list (usually C:\WINDOWS 'Microsoft Windows XP ...'). Press 'R' to enter repair mode. When prompted, press 'F8' to accept the Windows licensing agreement.
8. Windows will initiate a repair installation. When complete, your operating system is restored but your files and data remain intact.