Rundll32.exe error while turn on or shutdown the Computer

Rundll32.exe error while turn on or shutdown the Computer

First, the rundll32.exe process is responsible for running DLLs and placing its libraries in the memory. The rundll32.exe process is known as a command line utility program, and it performs its embedded functions along with the rundll.exe file.
Since rundll32.exe is a system process it should not be stopped. The process is required for your PC to work properly.

There are two things that usually cause that runtime error "c:Windowssystem32rundll32.exe" its either your rundll32.exe is infected by malware or corrupted. In case your rundll32.exe is infected, you can easily tell by just looking on the Task Manager if there are multiple processes running as rundll32.exe.

See the image below.

The only solution I have for you is to replace the rundll32.exe with the backup located on your computer.
YOU TRY AT YOUR OWN RISK.

TO COPY FROM BACKUP LOCATION
1. First to take ownership of the rundll32.exe file go to Start menu > Run. Type "cmd" to open Command Prompt without quotation.

2. Now type the following command to take ownership of the file :  "takeown /f  C:WindowsSystem32rundll32.exe"

3. Don't hurry, we still cant delete the file, we have just taken ownership of the file and have no control over the file yet. Now type the following command to gain full access on the file : "cacls C:WindowsSystem32rundll32.exe /G rdx:F" (NOTE: Please replace ‘rdx’ with your System Username)

4. That's it, now head over to "C:WindowsSystem32" and delete the rundll file. If you still cant delete, restart your computer in Safe Mode and open CMD. Then type in "del C:Windowssystem32rundll32.exe". This will surely erase the file from your system.

5. Copy/paste your backup rundll32.exe into "C:WindowsSystem32rundll32.exe". Your backup file will be located in either "C:WindowsPrefetch" or use search in "C:Windowswinsxs" mine was located in "C:Windowswinsxsx86_microsoft-windows-rundll32_31bf3856ad364e35_6.1.7600.16385_none_d7dba7b30c3e2855"

Note: You may find many Rundll32.pf and similar names but there is only one rundll32.exe

Hope it works!