ICS from XP (Wireless & LAN) to Vista (LAN)

ICS from XP (Wireless & LAN) to Vista (LAN)

I'm trying to get my new Vista Ultimate computer to share the wireless connection my XP Pro computer has via a LAN using an old Linksys router I have. After 2 days I finally got my XP computer to be able to access the internet and share files via the LAN, and the Vista computer can share files but cannot access the internet using the XP's wireless connection.