Most of my Linksys work, but not this 11S4

I have a Netgear a/b/g wireless card for my laptop. At my school, I
have no problems connecting to their routers (which have security)
using Odyssey Client. At my house, I have a Linksys B router, and have
no problems there, with or without security.

But I come back to my parents house, who have an older Linksys, the
11S4, and I can't get a good connection. It sees the connect. Signal
quality is great. It finds the connection, and it even says "open". My
icon is even dark, showing a connection. But the packets in/out number
is very low/high, and I can't seem to get a connection. Is there some
setting on the router we need to change? We've made sure there is no
WEP or Mac filtering. My parents have no problem connecting to this
router with their other computer. I'm running Windows 2000.