1) Do you have more than 3 primary partitions on the Servers boot hard drive ?
If yes, then you can not install the Ghost client, since it needs to create a partition also.
2) FIle, printer sharing on.
Did you check the log for the remote install. It usually provides info on why it could not install.
Worst case, create a Ghost bootable network CD, and use that to backup the server, then try to get the remote client installed, after you have at least 1 full backup.
I hope this helps !