Vista Install

I just installed Sins for the 3rd time.  I can't make it run as it seems to be unable to run except if I log in as administrator.  The online installer puts everything in a folder that denies access to any user except the administrator - I can't even open the manual pdf.  I suppose there must be some setup feature in the installer that changes this - but I sure can't see it.  As a default setting this is just plain WRONG.  No game, and particularly no game designed to connect to a network, should ever be run with administrative privileges.  I will continue to try and find a way to get access as a user, but I should not have to jump through these hoops to accommodate bad design. I suppose my frustration is beginning to get the better of me, but as I see it this game is not only unplayable, it is unstartable.