Many times you might have confronted with a error message in windows saying that the file is in use and cannot be deleted, and to check whether the file is in use and all that.
This software called unlocker can be used to unlock all the resources which hold up a file.
Just install the software from here:
Right click the file which you want to unlock and the click unlocker.
A new window will open giving out all the possible executables using that file, you can terminate these processes to unlock the resource, but beware of this, You do it at your won risk.
you can download Unlocker and get the details from here: