Vista - Determine if user contained in Log On As A Service local policy...

Hello all,

I have an install that prompts for a user/password and uses this entry
to install/control a service.

If, on the target machine, the user entered is not currently included
in the Log on as a service local policy, I get a fatal error. What I
would like to do is take the user entered and query the Log on as a
service policy to see if the user is present. If not, I would simply
show a message indicating such and return to the user entry dialog.

Is there any way a vbscript could handle the quering the policy?

If even possible, I really don't want to add the user as I would like
to include this step in some type of documentation referenced in the
informational message box encountered if the user is not in the
policy. If there is a way to add the user via code, you could mention
that too, but I'm not necessarily looking for that piece.

Any help appreciated.

THANKS in advance.