“Option Button” in XP logon Script

My co-workers are struggling with an issue: how when a user logs on to our network, can the end user be kept from seeing the option button? My colleagues know that the script must be modified but they are having trouble.

Any examples would be helpful…I am a go between but feel among all the readers out there, possibility exists that someone might have wanted to do this.

This is a school. No one has a dedicated machine-this allows students to access there network folders from any pc connected to the school netwrok.
tia
sheila