I finally managed to install the latest driver for my Fireface UCX (06/25/2018 1.1.64.0) on my Windows 7 PC. 

I just noticed in Control Panel-> Programs->Programs and Features that the old driver:

Windows Driver Package - RME Fireface USB (12/15/2016 1.0.98.0) is still listed. If I right click and try to Uninstall I get an error:

ERROR: File 'C:\windows\System32\DriverStore\FileRepository\fireface_usb.inf_amd64_neutral_86c3edd7294add12\fireface_usb.inf' not found.

So my question why can't I uninstall this old driver from the Control Panel Programs and Features list ?
Thanks.