That's the obvious item.
I have a laptop here running XP Pro that can login to the network, process/run login scripts, access the internet, mail servers, shared drives and other various network resources however the laptop in question cannot be pinged, accessed or otherwise be seen on the network (i.e.: \\Laptop\Share$, \\IP.ADD.RE.SS\Share$; ping IP or host = request timed out) The routing tables look fine, it is authenticating as it should, we've tried two different subnets, releasing and renewing the IP, even used a hard coded IP but the machine could not be pinged or otherwise accessed. I thought maybe the TCP/IP stack might've been corrupted some how so I removed all of the protocols and clients for that NIC however TCP/IP would not disappear from the list. I removed the device from device manager and upon Windows reinstalling the device, after a reboot of course, there was no change. Aside from reimaging the machine, what else do you suggest I try.