From the doc: 'KillTree was made to be a replacement to the 'deltree' command in MS-DOS, as well as the del command in some cases. KillTree works by deleting an entire directory tree (a directory and all of its subdirectories) with only one command, and is much faster than deltree. If any errors occur in killing the directory tree, KillTree will abort and notify you, you may then fix the problems (usually attribute problems) and run killtree again.'
killtree.exe