wireless card install crash name resolution on 98SE

hello,

I tried to install a Wireless Card (Prism 2 - PCMCIA) on a laptop (w/
98SE) this afternoon.
Setup was ok, card can detect my AP and connect to it !
DHCP can setup IP + Gateway + DNS, and I can ping any host on LAN
(gateway) or Internet (ISP nameserver), but it can't resolve name !
And after that with the ethernet card, the problem occurs too (the
ethernet card was working well before)

I install again 98SE, and tried again with another one (Ralink rt2500 -
PCCARD), and the same problem occurs !
After that I can't resolve name....

Any idea why ? or even how to resolv this problem without installing
again 98SE tomorrow (yes it's night there in France ;-)

thanks,

Alexandre