In my case, I had 2 services attempting to run from one instance of Mezzmo Pro. I have a custom server name for my media library which generates a service with that name. I also had the default service, named Mezzmo (default server name). Both were trying to run automatically at startup and conflicting because there is only one instance of Mezzmo.exe running. There are 2 fixes. Once, simply disable one of the services. In my cause I disabled the default service, restarted my PC to test if my custom server name/service would startup automatically, and it did. Alternatively, you could delete the service you don't want/need and restart. Run your registry editor and navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\servic es. Export the ..\services folder as a backup. Find the service name you don't need/want and delete the folder. Restart your PC to test if the other service starts automatically.