Hello,
Two suggestions:
1) Make sure the tool that you are running to change these settings is
running "as administrator" - it should either black out the screen and ask
for your permission when it starts, or you will need to right-click it and
click run as administrator. If the tool is a command-line tool, run cmd.exe
as administrator.
2) Instead of the default user folder, try: C:\Users\Default (as you
guessed, this is a new location for this folder in Windows Vista)
--
- JB
Windows Vista Support Faq
http://www.jimmah.com/vista/