Local area network disable internet connection

Hello,
i have a strange problem, i explain
Computer A win XP ip 192.168.2.231 with onboard network card
Computer B win 98 ip 192.168.2.232 with pci network card
Router Linksys WRT54GS, with ip 192.168.2.230, but i use it just like a hub because i don't have here internet connection
both computers connected with cable and all work nice.
Then i added a wireless/USB Planet because i want to connect it to another router in another building to get internet connection, so i connected this Planet wireless/USB to computer A, all work nice, i get signal internet connection and ip 192.168.1.102
but ..... and that is the problem, when i connect computer B win local area it disable my internet connection, i try to ping some domain name from computer A, where Planet adaptor is installed, but it try to find this domain name in local area instead to route in internet connection, if i deactivate local area ..... internet connection work like a charm.
I tried to change several ip groups, all in 192.168.1.x, tried to disable, enable DHCP server in router, tried to change subnet mask, tried to use proxy, to play with router configuration...... nothing it not work.
So i think something about network onboard conflicts, so i installed a new pci card in computer A, ouffff nothing when i active local network i stop to have internet connection, i tried also to install another USB wireless adaptor and connect it via wireless with router, nothing ... when i active local network i stop to get internet connections
So the only way to get internet connection is do disable local network oufffff
any suggestions about ?
tks
Max

No i don't have wireless card in 98 computer, it have only pci network card.
Windows xp computer have on board network card, local network, and USB Planet adatptor for internet.
Forgot to say that, both compuers are connected to router1 WRT54GS, i use it just for local area network and printers
Via wileress USB Planet adaptor i want to connect to another router WRT54GS located in another building, all work nice, i get internet etc... my problem is local are, when i active it .. internet connection stop to work

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