If your Windows system has this annoying rundll32 error, then it could be the time to fix it. However, first you need to know what exactly Rundll32 exe is in order to understand how to fix rundll32 error on your Windows system. Rundll32 is an exceedingly important system process that affects the speed and efficiency of the computer. It is an essential DLL file in the Windows registry. The registry is the principle index in your PC that is essentially the engine that runs the system. As you install new software
or took away the older ones, the info is left over in the registry.

What Causes a Rundll32 Error?
If not correctly maintained, the registry becomes swollen with both redundant and corrupted info. This is what can cause the Rundll32 error. The presence of a Rundll32 error can cause a lot of problems to your PC. The error message will immediately pop up at different times, messing up your CPU performance. PC freezing, windows blue screen and computer crashing are side effects of rundll32 errors. You’ll also notice that your PC runs really slow and slow at certain times. sfp2007.