I have recently upgraded an NT server to Windows 2000 with SP4 slipstreamed into the install. When I attempt to install the ArcServe 2000 client agent, I am presented an error with the NTagGUI.dll cannot be run. However, the install allows me to continue with the message "Failed to install CA license. Please install the CA license from %s after Arcserve setup is completed." Again, I am allowed to continue, however, when the install reaches the point of starting the client agent service, the service will not start. I am left with event viewer messages stating the "client agent for arcserve has terminated unexpectedly". It appears as though the software is installed, but I cannot get the service to start. I have installed Arcserve numerous timees on servers w/o 2000 sp4 with no problems. The fact that 2000 sp4 is installed prior to installing the Arcserve software leads me to believe this is the problem. I have looked on CA's web site for a solution but have been unsuccessful. I'm wondering if anyone knows of any patches or workarounds for this. I unfortunately cannot take the server down to rebuild it. Any help is appreciated!!!