diatech

Hello; I work on an IT helpdesk. Some of my co owrkers (who know a little bit more than me) think its funny to schedule tasks remotely (we are all domain admins) that run vbs scripts (we are able to access any computer in the network via \\computername\c$\). How can I disable this, so that they either need a password, or limit it to my own credentials only? Thank you, Dustin Formisano