wireless connection issue

I have a Gateway 400VTX (about 6 yrs old) and it came with an ORINOCO mini PC card. I purchased a Linksys WRT110 router and cannot get it to work. I can see the wireless network, but when I click to connect, it just hangs with the message “waiting for the network”. Never connects. I have started from scratch several times with no luck. I can connect to an unsecured wireless network in my neighborhood with no problem. Could it be the PC card is incompatible with the router? Can’t find anything via the web to verify this or not.