I tried to add all my picture files to Lightroom but must have made a mistake. It addedand duplicated files until the C drive was full. I am now trying to delete them all but retain the original files. Is there an easy way of doing this other than individually deleting 28,000 files which is very time consuming?

If you just did undo cmd when it was happen it deleted them immediately but now u have to arrange icon by time and select those picture on the same time...and press shift+delete button to permanently erase from hard disk.Arjun {{www.winserver08.tk}}