Can not Windows update?

1. Click Start, and in the Search box on the start menu, type CMD, then press Ctrl+Shift+Enter (this will get you an elevation prompt for an Administrator command prompt)
2. At the command prompt, type net stop wuauserv, then press Enter
3. Type rmdir /s %windir%\softwaredistribution\DataStore, then press Enter. Type Y to acknowledge the command.
4. Click Start, and in the Search box on the start menu, type regedit and press Enter
5. Go to HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows \ CurrentVersion \ WindowsUpdate. Right-click on WindowsUpdate in the tree and choose Delete (confirm deletion). Close Regedit.
6. At the command prompt, type net start wuauserv, press Enter and close the command prompt.
7. Use the Windows Update again to install updates.

參考:https://www.windowsbbs.com/threads/can-not-download-updates.97594/