Remote Desktop

Hi, i am trying to allow remote administration of a windows 2k laptop by any number of machines (more than likely windows xp). I have the software installed on win2k and can connect and remotely administer other PCs with that machine, but when i try to connect to that machine and remotely administer it, it gives me an error:

“The client could not connect to the remote computer”

“remote Desktop might not be enabled…”

Anyways, this machine is a floater for our marketing department and needs to be up and running in 3 weeks, any suggestions would be appreciated, thanks.