I downloaded the RTM for Win 7 Pro x64, build 7600 from MS Software Assurance and installed it as an upgrade to Vista Pro. All seemed to go OK until I tried to connect to the internet. I can connect to the other computer on the network (wired through a Linksys WRT160NL router and also running Win 7) and transfer files between the systems. The other system connects fine to the internet. My main system does not, and has a red X in the Network and sharing center.
The system is ASUS P6T Deluxe motherboard, Core i7 processor, 6 GB RAM, Lan is Marvel Yukon 88E8056. Router is connected to a Linksys CM100 cable modem via ethernet cable.
I have restarted/rebooted everything, changed cables, checked the LAN driver (latest) with no success. I worked fine with Vista and if I restore the Vista C: image it all works again. Reinstalling Win 7 gives the same problem.