Give user install control on their own machine

Im running a Windows 2000 network using Active Dirctory to manage the users and permissions.
I have a user on my network that needs to have administrative rights on thier own laptop when they take it home (as it is a their own machine).
How can I give this user permission to install software etc on their local machine without giving them blanket administrative rights to the server etc? Thank you very much in advance!