Lr Classic CC video not importing/ preview unavailable
I've recently built a new PC and all is working as it should, but I can't import video (mov, mp4, etc.) files into my lightroom catalog.
I'm running Lr Classic CC version 7.2 on Windows 10.0.16299 and I've tried removing Lr, using CC cleaner tool, reinstalling and still have not had any luck.
I've also tried with new catalog as well from different drives.
I've purged my video cache and reset preferences.
Neither copy nor add is working.
What am I doing wrong please?
Thanks