Darkz2012 discovered the real reason sfc /scannow does not work in build 14279, wrpint.dll is missing from the required folders for both x64 & x86(32bit) systems. If you copy the file wrpint.dll back to the right locations sfc /scannow works.
Now it's more than likely that the names are different but I am pretty sure the names would be pretty close depending on machine architecture that is, for X86 going off a hunch here but I would look in.
Copy the wrpint.dllAnd wack it in the appropriate folder. Also you will need to grant ownership from
System to Administrators to copy the file to the correct directory.
If unsure of the correct locations just delete or move CBS.LOG from
Windows\Logs\CBS run SFC /SCANNOW and open the log file and it will tell you the right location, or the location its trying to find the file in.
I will also state the the X64 Version of the file is about 65.5Kb &
the X86 Version is about 55Kb
I will post a SS to show that I'm not telling ya porky pies.