Think about the last program you uninstalled, was is a successful uninstall? Or have you installed a new program lately and you are not sure if it was completely installed? These are possible leads to the solution of the problem. If you figure out that it could be an incomplete uninstall that is the culprit, install the program again and then perform a clean uninstall. If it is a faulty install of a software that is causing the problem then just do a new install of the software in question. If these steps do not solve the problem do a complete scan of your drives with your anti-virus software. Be sure that your anti-virus software is updated. You can also change to a better antivirus software if you believe that the antivirus you are using is not that good. Recommended antivirus software are Eset Smart security or Eset Nod 32 antivirus. You can also use Kaspersky Internet Security or the latest AVG antivirus. If you believe that the rundll32 error is caused by a registry problem, run your registry fix software. I recommend using RegVac or RegCure, there two registry software perform well.
If after doing the computer virus scan or registry scan the problem is still there, try doing a clean boot on your computer. To do this click on the Start button and click on "run". In the input field type "msconfig" (without the quotes) and hit enter. The System Configuration utility will open. Choose the selective start up option and deselect all the programs listed there except one. It doesn't matter which one you keep selected because you are doing this to try to find out which among the startup programs listed is the cause or the rundll32 error. Click OK and then reboot. Repeat the process but change to a different start up program every time you reboot until you covered every start up program in the list and you come into the program that causes the rundll32 error. Once you have identified the program that is causing the problem you can remove it completely or reinstall it properly.
