Windows Update error (Your device is missing important security and quality fixes)

Hello Arush47 

Please run the below commands in CMD. Ensure you run CMD as an admin. These commands will delete the Windows Update registry log on your machine and then next time you click on check for updates, WU will check against the entire WU database.

Reg delete HKLM\Software\Policies\Microsoft\Windows\WindowsUpdate

yes

Net stop wuauserv >NUL

Cd C:\windows

rmdir softwaredistribution /s /q

Net start wuauserv >NUL

I am sure this will help. Let me know how you get on.

Thanks,

Jose