Hi Susan,
Thanks for responding. I just checked two of my machines and Win Update has started working again without making any DNS changes (ISP = COX residential, but not using their DNS as primary). I'm waiting for a call-back from an OEM vendor to see if his updates are working again (COX business class).
I have one Win 7 64-bit machine that has KB2982791 installed, but not KB2993651. Is it OK to install it without first uninstalling KB2982791? I know MS "highly recommends" uninstalling, but I ran into some problems doing so on another machine (boot and IE problems which I was able to resolve). MS doesn't seem to state the ramifications of doing so. Any thoughts?