Auto LogOff after Inactivity

I am trying to find a solution that will auto log-off a user on Vista not
connect to a domain after inactivity. I know that winexit.scr worked on XP
and I tried it on Vista but it gives me a Registry error on executing and
setting the settings.

Also, tried LogonExpert but that doesn't seem to have the option to logoff
after inactivity - only logoff at specified time.

Are there any other alternatives out there?

Thanks in advance...