home lan

Home LAN problem

We have a home LAN with just two PCs. PC1. Dual boots XP and Vista and is connected to a broadband cable network. The internet connection works fine from either OS
PC2. Is a Vista only machine, it connects to the internet thru PC1 above. The connection via XP works OK, but when both machines are using Vista PC2 does not see the internet (it seems PC1 OK though).
The TCPIP settings on PC1 appear to be the same for both OS, any ideas?

Windows Vista

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