DO and Explorer suddenly refuses to copy or move files?

I am using DO version 11.19 x64, and suddenly it refused to do file copies or moves.
Obviously i tried several hard drive and even tried folders with only 4 or 5 very small files in them.
I do get the panel on the screen, but saying counting files for up to 12 hours before i cancel it.
I have chkdsk'ed all the drives and done muliple separate anti virus runs, Bitdefender, spyhunter 4,CCleaner etc
And to make it worse the same issue now happens in explorer. Both stopped at same time.
No new programs have been installed.

Anyone know whats going on ???