ALL Internet Connectivity Has Stopped

In my house there are two PC's. One with XP Pro and One with Vista Ultimate. They both are connected through Ethernet Cables with a Linksys WRT54G Router.

The XP Machine is right next to the Router, the Vista Machine uses a 100FT Ethernet Cable routed through the attic.

My problem is, all of a sudden my internet has just stopped working on the Vista machine. I would restart my PC and it would work, but then eventually crap out again. I know there has been reports of XP and Vista having trouble on the same Router as far as IPv4 and IPv6 goes. I have not installed anything recently so it cant be related to that.

Can anyone help me with this, I really need that PC's connection back up for Business purposes.

Thanks

 

Update:
Found out that everytime I send/receive with outlook that it stops my internet??