I updated some of my machines, but one just will not do it. Someone recommended to run chkdsk.
So my machine initially said that there are no errors; that I don't need to run chk dsk. When I ran it anyway, "Windows found errors on the drive that need to be repaired. Close this dialog box and then repair the drive."
Typical MS completely unhelpful information. It's like being stranded in the desert - no useful info whatsoever after this.