I have no problem mapping to my network drive using the computer name. I have to map with the IP address in order to reach the server from my home. When I map the server using an IP address it hangs/no response for a long time then finally connects (after a few minutes). This happens both in mapping the drive and later accessing the server/folder. I have no problem connecting to the server with the IP address using other computers in the office with the same IP setup.
I am using a Dell Latitude D800 running XP Professional. It is current with all updates and has been checked with virus and adware software. Dell has diagnosed the computer and says there are no hardware problems.