Networking system is troubled

I have a windows 2003 server with 4 xp workstations
ISP ROUTER ----> SWITCH -----> SERVER -----
                                                    WORKSTATIONS
DNS/DHCP are disabled on Router
DNS/DHCP are enabled on the server
All workstations have static IP addresses pointing at the server for the DNS
I do not have roaming profiles (just using 1 username for all workstations)
All workstations are in use 24 hours a day.

I have 3 problems
1) It takes a long time to log into each workstation
2) Sometimes I lose my shortcuts on my desktop. Is there a way to create a script for this?
3) When workstations are idle for a while, my shortcuts to the server freeze.