Unable to clean up, pre-translate and analyse TTX files

After installing QA Distiller, you are unable to clean up, pre-translate and analyse TTX files in SDL Trados 2007.

Go to Start > All Programs > SDL International > SDL Trados 2007 > Trados.
Run Register SDL Trados 2007.
If you are using Windows Vista or higher, then you can right-click on Register SDL Trados 2007 and click Run as Administrator.