It is a 'Profiles' issue.
You must 'establish' the parameters for each and every individual user profile.
And, even then it may not work.
There are some so-called 'work arounds' but they are not so smple to describe and it would be best for you to 'exhaust' other efforts first.
Or, blow out Vista and install XP
without Service Pack 3 !
Isn't Vista more fun than a hat-full-of-***holes ?
