Tried and tested, this creates the correct permissions and can be read and written by any account on any WinOS - even UAC. Hey download Harmony in a UAC account and then run it from Admin or another UAC - it works (and there is a load of disk IO going on)!
http://www.pjio.com/temp/Harmony_setup.exe
http://www.pjio.com/temp/Harmony_setup.exe