Win2K Network Failure

I installed win2K on a workstation of my company, & it soon get lost in the LAN. It worked fine as a win98 b/4 this, but as win2k, the networking started 2 fail (including internet). It is not a total failure tho, as the PC will be able to access the LAN & Internet after each reboot, but soon fails after a few mins.
Some corrective measure i’ve performed included the updating of drivers, changing of networking card, renaming of the PC to single 2-letter name. Is that any unforseen possibilityof conflict i missed out?