Hey guys. thanks for the replies.
So I restored the pc's. Then went through one by one of the updates, and found the culprit on both pc's.
KB3045999 - this is the one, after reboot, puts me back into the computer cannot start. Both pc's have ssd, so the blue screen that pops up, is a split second, and I cannot see what it says.
Both pc's have windows 7 64bit. All updates except the bad one. Again, different hardware.
Here's the thing that is a little scary. As I mentioned before, both these pc's were ON and online of course. I have 2 more pc's, same windows install, that were off at the time. When I went to update those 2 pc's, the KB3045999 installed just fine. WTF!?
My router is a TM-AC1900 (TMOBILE'S FREE VERSION OF THIS ROUTER) None of the computers connect via WIFI. My wifi is WP2 protected, but all 4 pcs are hard wired.
So I basically, restored both, installed all updates except the KB3045999, then I ran, MS Security Essentials scan. No virus. Downloaded malware bytes, did a scan, no virus.
Hope this helps, and we can figure this out. Thanks!