Stupid Wireless Internet

It's pissing me off
. I got a wireless network card for my PC two years, and while it never worked great, it's just decided to stop working entirely. I got it two summers ago for when I come home for the summers, and it worked fine then, and last summer too. It also worked all last year at school. But I just got home, and my dad switched the modem and we have a new network. Fine, no problem, oh, except now it won't connect!
I use a Linksys WMP54GS card, which has some sort of Linksys software that detects signals and such. I get to the point where it says I'm connected to the access point (router) but not the internet. Since this didn't work, I tried to find the Windows XP utility that finds wireless connections. And while I know I did have it (all computers have it), it's gone now! My computer just up and forgot it was capable of finding wireless networks!
If anyone here has even the slightest idea of how to fix it, it would be greatly appreciated. More specifically, how I can get wireless connections to show up in my Network Connections.
Thanks

I use a Linksys WMP54GS card, which has some sort of Linksys software that detects signals and such. I get to the point where it says I'm connected to the access point (router) but not the internet. Since this didn't work, I tried to find the Windows XP utility that finds wireless connections. And while I know I did have it (all computers have it), it's gone now! My computer just up and forgot it was capable of finding wireless networks!
If anyone here has even the slightest idea of how to fix it, it would be greatly appreciated. More specifically, how I can get wireless connections to show up in my Network Connections.
Thanks