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Rundll32.exe is a process that runs DLLs and stores their libraries for more efficient use by applications. This program is important for the stable and secure operation of your computer and should not be stopped. Check if the rundll.exe file is in the System32 folder. If this is the case, it is Microsoft’s legitimate process, otherwise it could be a virus.
The following is mainly based on the fruitful discussion at TechNet, and the important points have been selected from there and presented here.
The Windows Rundll32 host process no longer works
If you receive this error message frequently, here are some troubleshooting steps you can try :
1] First, make sure your Windows is fully updated.
2] If you get the error when opening folders containing video files, turn off thumbnail display and see if it helps :
Open Control Panel > Folder Options > Always show icons, never thumbnails
3] Try to remember when this error occurred.
Was it after a particular program was installed? Was it after the installation, say, Nero? If so, try this:
Open Computer > System Driver > Program Lists > General Lists > Preferences > DSfilter. Rename NeroVideoProc.ax to 1NeroVideoProc.ax. Also rename NeVideo.ax to 1NeVideo.ax.
You can update or uninstall the Nero software and see if it helps.
4] Intel ViiV software and the K-Lite Codec Pack are known to cause this problem. If one of them is installed, update or uninstall it and see if it helps you.
5] Follow these steps to find out which software is causing this problem.
Run msconfig to open the System Configurator window. Click Services and select the Hide all Microsoft services check box. Click the Disable All button.
Click the Start tab, then click the Disable All button again. Press the OK button and then the Restart button in the next window.
You have disabled all non-Microsoft services and starts.
When the problem is solved, reopen the system configuration window, then enable all services in the Services tab, and after restarting your computer, check the problem in the same way as described above by disabling one service at a time.
6] Disable data execution prevention and see if it helps. But remember, this is a security feature designed to protect your computer.
7] Troubleshoot Microsoft Windows files and folders and see if this helps.
In this way, you must enable/disable the services and start limiting the author. Okay, it’s a long and painful process, but it will help you identify the perpetrator.
This message will help you when you receive the Windows message Shell Common Dll has stopped working.