Tried two different keyboards, one the old packard bell 101/102 key, and another a memorex 101/102. Both are standard no-frills keyboards. No special buttons for web navigation, and both are known to work on machines also running XP pro sp2.
I found mention to that problem on anoter board: http://www.techimo.com/forum/showthread.php?p=1421550#post1421550
The lan is the CICADA8201 Gigabit LAN port to a netgear 4 port 10/100 switch to a DI-604 router to the sprint dsl modem. I've tried bypassing the switch and connecting to the router with no additional sucess. The network is shared by two-four other machines, all macs usually.
Dunno why I said I was using my firewire, how silly of me. Nothing about that controller appears in the control panel as far as I can tell, and the 1394 is mentioned in the network adapters section, so I cut n' pasted.