Install software remotely w/admin rights

I have several laptops not connected to a network or able to dial up to the internet at several offices. Several times a year I have to install upgrades of sveral types of software (accounting, database etc)Is there a way to, either package this software so that it will install with root admin properties or setup an admin account that this software will install without the user gaining knowledge of the passwords?
Our OS is WXP pro. Be specific especially if mentioning using a script
thanks