There were four windows 10 updates between December 9th and 13th on my rig
Security Update for Adobe Flash Player for Windows 10 Version 1607 (for x64-based Systems) (KB3209498)
Cumulative Update for Windows 10 Version 1607 for x64-based Systems (KB3206632)
Windows Malicious Software Removal Tool for Windows 8, 8.1, 10 and Windows Server 2012, 2012 R2, 2016 x64 Edition - December 2016 (KB890830)
Cumulative Update for Windows 10 Version 1607 for x64-based Systems (KB3201845)
any one of these could seem innocuous on the face of it, until you look at the list of effected files of which there are 15,000 entries in one of the releases.
I am guessing there will be quite a lot of investigative work to determine which one has caused the headaches.
I guess we could help if one of us has not installed certain updates but is experiencing the problems. It might assist the CW guys in narrowing down the cause. My guess is it is not the flash player update but I have been known to have been wrong