I use delta copy on Vista ultimate to backup several windows machines as well as my cvs repository on Linux. I inadvertedly configured the service to start as a network service but found I couldn't access the backup at all. I subsequently changed it to start as my user and could access the new directories but was left with a backup directory I couldn't access or delete.
This is how I eventually managed to delete the directory.
Start accessories right click on the command prompt and select run as administrator. At the command line type
takeown /F [directory] /R
cd [directory]
cacls *.* /T /G "[PC NAME\USER NAME]" :F
cd ..
rd [directory] /s
