cannot delete folder. delete folder using cmd. Error: The action can't be completed because the folder or a file in it is open in another program.

If you also encounter the stated error when you try to delete a folder, you can try to delete it using the cmd. I get the source from here.

Me error command look like this.

type " rmdir /s " follow by the direcctory name, if you are lazy to type it out ( or whatever reasons, i.e. name too long, use the tab key to help you. If your folder name contain space, do use "" to cover it up. e.g " rmdir /S "Assignment 1 ".
navigate to your directory, by using cd, then

Note: make sure you use the capital S..

to move a folder,type " move oldDirectory newDirectory".

Cheers!