If you are looking for the complete solution to fix Error: 646 “Unable to update Windows”, then follow the 8-step given resolution and you can easily update your PC. Each step is accompanied by an indicative screenshot for ease of mirroring the action.
Type the password and click ‘Continue’.
You have accessed your computer and successfully fixed Error: 646. Now you can update your operating system. We recommend that you must update your Windows® from time-to-time to enhance its functionality. If you face any problems related to your computer, operating system, software applications or peripheral devices like printers, MP3 players, digital cameras etc then call iYogi and we’ll fix it.