I'm using 3Com 3C509 & 3C905B & C NIC's with the packet drivers & Ghost 5.0D. When I use the 3C509 ISA cards in any system, they work fine. When I have a system with a 3C509B or C PCI card in a PII or PIII system, it locks up. Try them in an MMX or older system & they work fine. I tried looking on the 3Com site for tech support or a contact e-mail, but couldn't find any. Anybody got any ideas?