The reason it is still there after rebooting is that it is not being removed from the registry.
Try the following to see if it has success. Step 1.
Go to Start > Run and type the following command and hit OK.
“%PROGRAMFILES%BonjourmDNSResponder.exe” -removeStep 2.
Go to Start > Run again and type the following command and hit OK.
regsvr32 /u “%PROGRAMFILES%BonjourmdnsNSP.dll”Step 3.
Restart your computer.Step 4.
Delete the Program Files Bonjour folder. Note:
You need to enclose the command in ” “, or double quotes. Just as it is shown above. It may be easier to copy and paste the command to ensure that the spaces and quotes are in the appropriate places.
Also, if this does not work, try this tool here --> TurnOffBonjour.exe
It can be located under the Parent Directory
20th link in the column. Basically what it does is it turns off and removes the redundant Bonjour service from your computer. You are still required to delete the Bonjour files and folder from your C drive manually.
The above information was collected from the link below that I am providing for your reference. What Is And How to Remove and Uninstall Bonjour mDNSResponder.exe Process
In the meantime I will search for more solutions that may help. Please keep me informed to you progress.