Error code

Windows 0x80073701

WINDOWS0x80073701
System Error Code· A POSIX/system errno returned when a system call fails.

What it means

ERROR_SXS_ASSEMBLY_MISSING: the referenced assembly could not be found..

Per dataset:Windows

The referenced assembly could not be found..

Per dataset:Windows

How to fix it

  1. Repair the component store with DISM /Online /Cleanup-Image /RestoreHealth.
  2. run sfc /scannow.
  3. restart the device.
  4. then retry the update.

Not affiliated with Windows. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.