I'm running Win 10 v1803 and Fences no problem - Fences is not your problem
Try running SFC to check windows then try your Win update again
To run SFC
Please try the following:
-For Win8/10 Users: Open the Start Screen, and type 'cmd'. Right-click on the search result and select 'Run as administrator' from below.
For Win7 Users: click Start, in the start search field type 'cmd'. Right-click on the search result and select 'Run as administrator'.
-Type: sfc /scannow
-Wait for the scan to complete (this can take several minutes)
In addition, please also run the following command in the same elevated (Run as Admin) command prompt window:
dism.exe /online /Cleanup-Image /RestoreHealth
The above command should assist with replacing any damaged or problematic system files. Please note, however, since it may require restoring certain files, this process can take some time and you will need to be patient until it has completed.
Please let me know whether this resolves your problem or if you have any additional questions.