Windows says your file is in use because it's open in another program? Learn how to force rename, delete, or move the file.

To delete a file when it is open in another program, first close the program using the file. If the program is unresponsive, press Ctrl+Shift+Esc to launch Task Manager, find the program, and ...

It won't work through the command prompt either if another program has locked the file. To find out what program has locked a file, use WhoLockMe.

Then you select the file from the program’s list, select Delete from the pull-down menu in the lower-left corner, and click Unlock.