help pmiing

[Choking Victim]

whenever i finish rebuilding the map and replace the rebuilded map with the original it doesnt start the level it just exits out of the game and brings me to the desktop. im using this tutorial
http://files.halomods.com/viewtopic.php ... hlight=pmi and also when i try to delete a folder that i used for pmiing it wont let me it keeps saying "cannot remove folder characters: the directory is not empty." how do i delete them? thanks for the help