You should just be able to navigate to that folder and delete the files manually. If you can't get into the folder (if it gives you an access denied error when you're logged in as an administrator), you'll probably need to take ownership of the folder. To do that, right click the folder, go to properties, then security, then advanced, then owner, click edit, click on administrators, put a check mark in the "Replace owner on subcontainers and objects" box and then hit apply. Once that's done you should have no trouble getting to the folder to remove the files.
