Seen that, only with a file named msvcrt.dll. Bugger won't move, and won't delete. What I found that did work was to copy it to where I wanted it, then I could delete it after rebooting. This is with ...

You may come across a situation where you are unable to rename a file on your Windows computer despite the file not being open anywhere. If you go on to rename it, you may see an error: File In Use, ...