This is the proper way to do it.
Because you have already removed Qmaster (at least in part) some of this might not apply:
*Remove and reinstall Compressor.*
To reinstall Compressor effectively, you need to remove the application, its receipts and associated files, then install Compressor and use Software Update to install additional updates. Follow the steps below to completely reinstall a fresh copy of Compressor. Note: Make sure that you have the installation discs for the application that Compressor was bundled with and the serial number handy before starting this.
Use Finder to remove the following listed items:
/Applications/Apple Qadministrator.app
/Applications/Apple Qmaster.app
/Applications/Compressor.app
/Applications/Utilities/Batch Monitor.app
/Library/Application Support/Apple Qmaster (the folder)
/Library/Frameworks/AECore.framework
/Library/Frameworks/Compressor.framework
/Library/Frameworks/MediaServerAPI.framework
/Library/Frameworks/Qmaster.framework
/Library/Logs/Qmaster (the folder)
/Library/PreferencePanes/Apple Qmaster.prefPane
/Library/Receipts/Compressor.pkg
/Library/Receipts/ProMediaIO.pkg
/Library/Receipts/Qmaster.pkg
/Library/Receipts/Qmaster_Frameworks.pkg
/Library/StartupItems/Qmaster (the folder)
In Finder, choose Go > Go to Folder.
Type the following path: /usr/sbin/
Click Go.
Locate the following items from that Finder folder, and drag them to the Trash:
qmasterca
qmasterd
qmasterprefs
qmasterqd
In Finder, choose Go > Go to Folder.
Type the following path: /var/spool/qmaster/
Click the Go button.
If there are any folders inside the qmaster directory, drag them to the Trash.
If you have Motion installed, drag it from the Applications folder to the Trash.
From your install disc, reinstall Compressor and Apple Qmaster (and Motion, if applicable).
When finished, use Software Update (under the Apple () menu) to update your software to the latest version.
http://support.apple.com/kb/TS1888
