I have 2 computers running XP and 2 machines in another room running Win 2k (all 4 ran Win2k before). Problem: When transfering files between a Win2k machine and an XP machine, or between the two Win2k machines, everything moves along nicely at 100 Mbps. BUT when transfering between the XP machines it's S L O O O W WWW..... (100 MB file takes about 4 minutes, compared to about 15 sec on the others.) Ideas? The network cards and hard disks must be OK since they perform flawlessly when talking to the Win2k machines.