you have to see if you are running identical protocols since Windows XP changed the default network protocol. the Networking Wizard on XP should have offered to create a disk with the appropriate device drivers for older versions of Windows so that they all use the same network protocol. you will need to install the new drivers onto each of your other machines. one of them appears to have the new drivers already. you need to make sure that they are the same. also, with only 4 computers and a printer, why do you need two switches? one 5 port switch is enough. if you need to add another computer, replacing your existing switch with an 8-port one is the easier solution. there is more work in configuring the switches to allow all packets through that ought to be and also so that you end up with compatible IP addresses across the machines.

Herb....