I have an NT 4.0 workstation that is really causing me problems. It will not let me copy a file that is bigger than say 300K to or from this computer across the network. The user cannot print a large file to a network printer. I used all the diognostic tools I have (these are sparse) and the network card seems ok. I have 5 other computers just like it so I ruled out server problems. I have reinstalled the sofpaq from the Manufacturer and re-loaded all the drivers I can think of. I changed the network cable to a known cable etc. I can't switch the NIC because it is on board. I don't get any messages stating that a service didn't load. Any ideas on what to try next?