I did upgrade from Vista and read your link. Thanks.
Unfortunately the fix isn't fixing the problem. I ran Disk Cleanup being sure to check the box for the upgrade files. The directory stayed put. I then moved the dir from where I had mistakenly stuck it earlier to C:\$Windows.Q and again ran Disk Cleanup.
Now, although the dir is still there, a simple right click Delete does not recognize the dir. I get a windows error saying (paraphrased) 'Could not find this item. This is no longer located in C:\. Verify the item's location and try again.
I rebooted the computer but explorer reports the same message.
This morning I downloaded unlocker. I ran the program from explorer on the dir, released two processes which did not make a difference. I then Cut the dir and pasted same to a flash drive. The paste was successful but the source remained. I then dragged the dir to the same SSD location after first deleting the prior instance on the SSD and this was successful. The dir is no longer on C: I am pleased to report.