Okay people. Problem solved. I uninstalled the whole Adobe suite en installed it back and all of the sudden Camera Raw recognized the Canon lenses again. Don't know what happend in the first place, but I'm back in business!
An easier way to solve this might have been to install the latest DNG Converter that matches the version of Camera Raw because both put the profiles in the same location so if they were removed by mistake by an install then reinstalling the DNG Converter would have put them back.