Similar for me, this is the 2nd time had this issue after Anaconda suggested me to upgrade. Did a conda update conda and then get error:
File “C:\Users\User\anaconda3\Lib\ctypes_init_.py”, line 8, in
from _ctypes import Union, Structure, Array
ImportError: DLL load failed while importing _ctypes: The specified module could not be found.
Uninstalling and reinstalling is painful exercise.