Windows Update stopped working, or Service is missing
Go to Start / All Programs / Accessories. Right Click the ‘Command Prompt’ item and click the ‘Run As Administrator’ option. In the Command Prompt window, Paste the following command. REGSVR32 %SYSTEMROOT%\SYSTEM32\WUAUENG.DLL Press ENTER. You should see a popup that says the command succeeded. Exit the command prompt and try Windows Update again.