To Marty: Yes, I did trouble shoot. I tried to test the network via PING. Ping reports 100% packet loss, but I'm no longer getting error messages about data bytes and wrong size. The latter happened when we had a Linksys card with the Tulip driver.
The network guy, when he's not putting blocks on the wall jacks, is managing the routers, etc. etc. etc. re: Network or cable problems. The network jack was checked out before the NIC was swapped out. The error messges indicated the NIC was getting timeouts. Swapping out the NIC has caused these error messages to go away. The cable was swapped out and a different jack was tried. Neither of these changed the error messages. Regards, Marc