I had set my W2K8 server that hosts the WSSDemo.com virtual farm (4 virtual servers) to automatically install Windows Updates including recommended updates. Looks like the WFE server didn't update before the host OS updated and the network adapter in the WFE virtual machine was no longer valid so it couldn't connect to Windows Update to get the latest Integration Services.

The solution is to add the Legacy Network Adapter to the VM so that you can get back to Windows Update.

For forward planners, the solution is to update all guests first and shut them down before updating the host as the save state files from the RC1 version are not compatible with RTM.

Anyway, this is why WSSDemo.com was down while I was asleep...