[Solved] How to Fix Windows 10 Update Error 0xc0020036

Windows 10 update failed with error code 0xc0020036. The detail error message as below:

The product key you entered didn’t work. Check the product key and try again, or enter a different one. (0xc0020036)

In order to resolve this error, make sure the Windows services mentioned below are running.

Step 1: Press Windows + R keys together to open the Run dialogue box.

Step 2: Type services.msc and press Enter key to open the Service Manager.

Step 3: Locate the following Windows services are running:

  • Windows Update (wuauserv)
  • DCOM Server Process Launcher (DcomLaunch)
  • RPC Endpoint Mapper (RpcEptMapper)
Make sure Windows Update service and its dependencies started and running
Make sure Windows Update service and its dependencies started and running