Installation Problem with Client Software

I have a problem when installing the Navision Client on a machine. I install the Client software for “all users” on the machine and yet after installing and launching the Client a Microsoft popup of “Preparing to install” comes up and it requires the Navision CD to continue the installation. I have installed the Client on many machines and do not know why this keeps happining on this machine. It is running Microsoft Small Bussiness Server and worked fine. Only recently have they installed Terminal Services on the machine. Should I just try and restart the server a couple of times or is the registry just not picking up the fact that the Navision Client has been installed? The work-around I have now is to keep the Navision CD in the CD-ROM full time but this is not the desired solution. Please advice.

make a search on the forum for instalation w2k error this behavior is already discussed