My son was watching over my shoulder as I waded through this thread (I've had the same problem with that error), and he was interested that up till the very end (so far), there'd been only one posting a couple of pages back suggesting the problem involved a foulup in the IP change for WU, which was also his guess, probably tied up with the change to WU itself. If that's correct, then as already mentioned we should be back to normal in a few days once most if not all DNS servers are updated. The Google DNS, which apparently worked well for many, obviously must have been one of the very first to get the updated IP.
I for one will leave my settings alone for now -- everything else works fine, and we've got about a week and a half to go before next Patch Tuesday, which should be plenty of time for the DNS servers to get caught up.
I can't speak for other users, of course, but I strongly resent Jeeped putting the blame on, not even miscellaneous DNS servers, but specifically on those of ISPs. It's clear from this thread that many users who encountered the problem don't even use their own ISP's servers but third-party ones ... and my own provider, Execulink (formerly Golden Triangle), could give lessons in customer relations and tech support to many others. Back when the Wilders Security forums moved to new servers, the admins made a point of strongly urging members to add entries with the new IPs to their host files to ensure connectivity while the DNS servers got caught up with the move.
Wanna bet that between this mess and the "official" responses we've gotten, MS will have lost another big chunk of its market share?