If you can't delete an ISO file as the file is open in your System, check if it is mounted as a drive or not. Uses these proven fixes to resolve the issue.

If you cannot delete the font files and see Font cannot be deleted because it is in use message, take full control of it, and then delete it.

Apple Discussions poster wholemilk writs: "I'm trying to delete some files and I get the following message, 'Emptying the Trash cannot be completed because 'weezeer_beverly_ucv (1).mpeg' is locked.