The following is a 'last resort' only. It is not advisable to remove the service without the use of the official Muhimbi (un)installer unless you are on a 'pre-8.0' release. Always talk to firstname.lastname@example.org first.
If you somehow ended up with a corrupt installation and you cannot uninstall the Conversion Service using the ‘Add / Remove programs’ control panel then please follow these steps.
If you have your services.msc open then please close it.
Remove the service reference using the following command:
sc delete "DocumentConverterService"
Delete the “Muhimbi Document Converter” folder from your “program files” folder.
Reinstall the software.