If you have it in "stealth" mode that probably means it is set to not transmit the SSID. Therefor no wireless APs will appear when you search for one. You will have to manually create a profile for your accesspoint. Are you using the thinkvantage access connections on that IBM or just the windows wireless stuff?
It is pretty easy to work with once you get going. Just rightclick on my network places and go to properties. Right click on your wireless adaptor and go to properties. Click on the "wireless networks" tab and click add. Then you can enter the SSID, wep info, etc. Hit ok and it should add that location to the list as well as connect to it.