How To Fix Windows Rundll Error

You might have seen plenty of .dll (Dynamic Link Library) files in every application folder on your Windows computer. These are used to store common pieces of application logic that can be accessed from multiple applications.

Windows uses the rundll32.exe application to launch functionality stored in shared .dll files. This executable is a valid part of Windows and any damage to this executable can cause problems to your computer. Usually the rundll32.exe error in Windows occurs when the computer is infected with a malware or a virus.

Sometimes, removing the infection can fix the issue or you may perform Windows repair to troubleshoot the problem. The following Microsoft Support guidelines will help you fix the rundll32.exe error on your system.

Instructions

• You need to start Windows in Safe Mode. To get into Safe Mode, restart your computer and press the F8 key repeatedly until you get the Advanced Boot Options screen. Now select Windows Safe Mode With No Networking using the arrow keys on your keyboard. Then press the Enter key.
• Once your system loads in Safe Mode, perform a full system scan using your antivirus and antispyware program that you have installed on your computer. This will detect any or all virus and spyware infections on your computer. 
• Follow the onscreen instructions as provided by the antivirus program and delete the virus infections found by the software. Once the infections are removed, restart your computer. If this fixes the issue, you need not proceed to the next step. 
• If you still get a rundll32 error message, it probably means that your Windows rundll32.exe file is corrupt. If that is the case, then you must perform a Windows Repair Installation.
• In order to repair Windows, insert the Windows Installation CD into the computer CD drive. Now restart your computer and press any key when prompted to boot from CD.
• You will get the Welcome to Setup screen on the Windows Installation wizard. You need to press the Enter key to select Setup Windows XP.
• From the list of options, select the Windows Installation that you want to repair. To perform the repair, press the R key. You will be required to press the F8 key to accept the Microsoft licensing agreement.
• Windows will now try to repair the errors and reinstall missing and corrupted files, including the corrupt rundll32.exe file. When you perform Windows repair, your data and other files remain intact. So there is no risk of losing your data. 
• After the repair is completed, restart your computer. 

You should now have fixed the rundll32 error. If this doesn’t fix the problem, contact Microsoft Support Center and get advanced support.