Good golly gracious. Down for nearly two weeks. That really sucks. Sorry about that. I made the BIG mistake of attempting an in-place upgrade of my Windows 2008 R2 server to Windows 2012 R2. Boy howdy, don't ever do that. I just about wrecked everything. Fortunately, I was able to piece everything back together and everything is back and functional again.
The PROPER way of upgrading your server infrastructure is to install new servers, migrate the service infrastructure onto those new servers, and then bring down the old ones. Despite the fact that Microsoft allows for in-place upgrades of operating systems, I have been sufficiently frightened away from ever trying that again.
Friends don't let friends perform in-place upgrades!