How to Repair a Rundll32

1. Turn on your computer if you haven't done so already and put your Windows installation CD/DVD into your computer's disc drive once your computer is loaded.
2. Click 'Start' and select the search bar at the bottom of the menu.
3. Type the following command in the 'Run' dialog:expand d:\i386\rundll32.ex_ %windir%\system32\rundll32.exe.This automatically expands the content of the 'Rundll32' process within your Windows installation disc and copies it to your system folder, giving you a fresh copy.
4. Restart your computer.