W98SE Laptop Suddenly Can't See Two XP Machines

Archived from groups: microsoft.public.windows.networking.wireless (More info?)

I've had two XP boxes networked by cable to a Linksys WRT54G Router. Last
week I put a wireless Airlink card in an old W98SE laptop. Until today, the
three PCs "saw" each other and all was well. Today, the two XP boxes see the
laptop but the laptop doesn't see either XP box. The laptop does get
Internet access. No firewall settings or other changes whatsoever have been
made to the XP boxes. The only thing I did with the laptop yesterday was
adjust the RWIN setting.

Any thoughts as to why the laptop can't see the other two machines even
though they see it?