Rundll32 errors are caused by many problems including viruses, malware, spyware, or registry errors. Undetected viruses, spyware, and malware can be accountable for rundll32 errors as well as registry errors such as faulty or incomplete software installations or uninstalls.

A rundll32 error happens when Windows is unsuccessfully trying to load a file because it isn’t able to locate it anywhere on your system. This is when a pop-up appears indicating that a rundll32 error has occurred, Windows cannot locate a file, and you are frustrated and annoyed because the software won’t startup.

An easy but expensive solution is to call a PC tech specialist who will find what causes the problem and fix the rundll32 error or you can try a few things and hopefully repair the problem yourself. Before you start messing with your PC’s substantial processes and files it is substantial 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. Nonetheless, oftentimes the cause of the problem is not too complex and can be fixed by the typical 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.

In case you didn’t install any software recently make sure your virus and spyware programs are up to date and do a full system scan to try and detect any issues that may have been caused by these types of programs.

In case the rundll32 error still occurs 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 do this simply 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 procedure should identify what process causes the error. Once you know what process causes the error you select the tab at the top of the Window that corresponds to the item that has been identified. 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 some registry repair programs that can fix rundll32.exe right away.