I can no longer copy or move files with Windows Explorer. This affects local drives as well as network drives. Neither Ctrl+C, Ctrl+V nor drag and drop works. I don't get any response from Explorer; it just does nothing.
No system extensions or any tools were installed since yesterday when it was still working as usual.
explorer.exe and have tried rebooting the PC, but neither of these helped. I can successfully move the desired files on the network drive from a different PC.
Creating and renaming new files/folders works, as does deleting.