We have an Access 2000 program that resides on a server. Each user has an icon that calls a shell on their local drive to access the network application. The problem is that some machines load the program very quickly while others take several minutes to load. All machines are Windows NT 4.0 SP6a. All machines are at least Pentium II with 128 mb RAM. Some of the machines that load it slow are Pentium IV computers, so the machine speed does not seem to be the issue. We just upgraded our network switches to 100 mb so bandwidth is not the issue. Where should I start troubleshooting to resolve this issue?