Important: If your PC is producing mDNSResponder.exe errors, you should check your Windows operating system immediately!

The file mDNSResponder.exe is part of the program unknown from the manufacturer unknown. Its task: mDNSResponder.exe supports the Bonjour service used by iTunes.
mDNSResponder.exe is normally found in the directory %programfiles%\Bonjour. If the file is located in another folder, you may have selected this path when installing the software. Under certain circumstances, this can also be an indication of a virus.

How to fix mDNSResponder.exe errors

If Windows notifies you of mDNSResponder.exe errors, the cause may be the result of damaged or corrupted registry entries.
In most cases, it helps to check the Windows registry for mDNSResponder.exe errors!

If this does not fix mDNSResponder.exe errors, we recommend uninstalling the program using the Control Panel and then running a scan of the Windows registry again.

mDNSResponder.exe slows down my PC!

Programs and files can have a strong impact on the performance of a Windows operating system. In some cases, this also includes mDNSResponder.exe.
In case of doubt, you should uninstall the program in question.
If mDNSResponder.exe is in the Windows startup folder, it can slow down a PC. We recommend that you turn off the automatic startup of this program if you do not need this function.
Our advise: TuneUp Utilities disables unnecessary startup programs and Windows applications thereby minimizing the load on your computer. The software also fixes mDNSResponder.exe errors!

Is mDNSResponder.exe harmful to my computer?

mDNSResponder.exe is considered to be trustworthy. If the file is not located in the standard path, this may indicate the presence of a virus. Scan your PC with an up-to-date virus scanner. We recommend using the free antivirus software AVG Anti-Virus Free from

All information about mDNSResponder.exe:

The following information about mDNSResponder.exe is available.
Product name: unknown
Process name: unknown
manufacturer: unknown
Website manufacturer:
Standard path: %programfiles%\Bonjour
Category: Part of unknown.
Assessment: trustworthy