internet connection sharing issues

we have a ICS network via wireless hub set up. the host computer runs XP and my wi-fi device can access the internet properly. My Vista computer, however, can connect to the network and view the workgroup, but can not access the internet. Anyone know how to solve this?

unfortunately i don't have internet yet and that is not my wireless card... I'm thinking about just going back to XP. It worked before I installed Vista