Windows 7 cannot connect to internet and work network at same time.

I previously had two computers networked together. One had Windows XP and the other Windows Vista. I then added a third computer to the network with Windows 7 Home Premium. When I first connected the Windows 7 computer to the network I was able to connect to the internet but was unable to see?the other two computers?on the network. I looked at the IP address using IPCONFIG and saw that it was being assigned an address which wouldn't allow it to connect to the?network. I then manually assisgned the Windows 7 machine an IP address which would allow it to connect to the work network. This worked and I could now?connect to?the other two computers on the network but I found out that I could no longer connect to the internet. I then switched back to having Windows automatically assign the IP address and I was able to connect to the internet but was unable to see the other two computers again. The other two computers are able to connect to each other and connect to the internet with the IP addresses being automatically assigned but the Windows 7 machine doesn't. Any suggestions?

Source: http://social.technet.microsoft.com/Forums/en/w7itpronetworking/thread/11c7f35f-f1e2-4859-a0da-5104277d7d7e

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