Fix Windows Update Error Code 646
If you’re encountering this issue on Windows 7 or Windows 8.1, you should start this troubleshooting guide by running the Windows Update troubleshooter and seeing if your computer is not actually capable of fixing the issue automatically. According to affected users, one of the most common causes that might lead to the apparition of the 646 error code is a Windows Update or Background Intelligent Transfer Service that is forcibly disabled....