OT - network probs

[se5a]

problem:
computer wont connect to the internet

setup:
DSL router connects to the net.
all other computers on the network can connect to the net via the router.
all network settings apair to be the same.
computer can see the other computers on the network and is seen by them.
it is not the network card, the problem has ocured before - Last time I fixed it by reinstalling windows. and it has happend on 2 diferent network cards.
computer is running win98se.
router is a Nokia M1122

any ideas??