Rundll32 errors are caused by a variety of problems such as spyware, viruses, malware, or registry errors. Viruses and spyware that are undetected can be responsible for rundll32 errors as well as registry errors such as partial or broken software setups and installations.

A rundll32 error happens when Windows attempts to load a file but is not able to do so because Windows cannot locate it. This is when a pop-up appears indicating that a rundll32 error has occurred, a file cannot be found, and you are frustrated and annoyed because the software won’t startup.

You could call an IT specialist who would look for the cause of the problem and fix the rundll32 error or you can try some suggestions discussed in this article and maybe repair the problem yourself. Prior to tinkering with your PC’s essential processes and files it is essential to realize that you can permanently damage your PC if you remove or modify certain files that your PC uses to operate while you are trying to find the cause of a rundll32 error. Nevertheless, oftentimes the cause of the problem is not too complex and can be fixed by the average PC user.

When in doubt reboot your computer. This should be your first step to repair just about all PC errors, including a rundll32 error. If rebooting has not fixed the problem there are some other steps to undertake. If you have recently installed or uninstalled a program re-do the installation since this can often cause rundll32 errors.

Have you installed or uninstalled any software in the past few days? If not, make sure your virus and spyware programs are up to date and do a full system scan to find any security threats that are caused by malware.

Should you still get a rundll32 error you can try a clean boot on your PC which will allow you to isolate and test each system on your PC to see where the error is occurring. To perform a clean system boot type “msconfig” into the run dialogue box. Then choose the selective startup option and deselect all but one choice listed below it and reboot your PC.

Keep rebooting your system with only one startup option selected. This process should identify what process causes the error. Once you know what process causes the error check the top of the Window that matches the process that has been detected and select the tab. You then select one option below that and continue to reboot your computer until you find the process that causes the error.

If you are unsuccessful finding the error or do not feel comfortable altering your system, use a registry repair program. There are a few very good registry scanners that can fix rundll32.exe quickly.