Most of guys who updated Windows 7 or 8 to Windows 10 would find there are a folder named $Windows.~BT in their C drive. This folder occupies several GB space. If you do a Disk Cleanup work, the folder should be cleaned up.
But there may be another folder named $Windows.~WS also staying in C drive, and Disk Cleanup does not delete it at all. As this folder is very large (several GB), can I delete $Windows.~WS folder after the upgrade?
I do not know the folder so much. It is a folder generated when I was updating my Windows operating system. And I completely deleted it manually. After the reboot, nothing wrong happened.
I think Microsoft should make it clear whether this folder is safe to be deleted or not.