The funny thing about this is like in game having to many adminning ruins a good thing best thing to do is make 2 account one being admin but never use only to get system updates maybe install legit software preferably purchased material so there no alarm or well worries about system stability.... once you install all your common software make a new account call it anything but don't grant admin grant backup os or power user the next under... then of course login and test... go back to admin set limits on users
well goto either winnt or windows folder that has all the system files in it goto properties and user profile under your new user set restrictions make it read only and list under write deny it this is incase you get a good virus well admin isn't affected, also if you like do same for program files you can make it so you can install write but some programs require system folder usage therefore won't install or say install anyway with that program being unstable... this Vista is going after people want admin all the time having it makes your OS powerless to attacks no matter how good your anti anything is once hit tat file won't be the same unless you backed it up...
Vista supposed to have multi-levels on admin kinda like sys-op super admin and standard admin who can install things without need for system folder...