I had a similar issue with my 4-computer LAN at home until I decided to map at least one network drive from the XP system to every other system. Have not had issues since. It does seem to take a while to boot up, not sure if that's related to the drive connections or not. It goes into a funk for about a minute during boot, then pops out and goes to the desktop. Be patient. Once booted, access to the other computers is instantaneous.