Hi KarolisSa
I am Dave, I will help you with this.
Usually when the Windows Update service is missing, the best option is to perform an in-place upgrade with the Windows ISO is the quickest way to restore that service, an in-place upgrade will not affect your personal files or installed software.
Click this link:
https://www.microsoft.com/en-us/software-downlo...
to download the Media Creation Tool (Click on Download Tool Now)
Select Create Installation Media for Another PC, then choose ISO not USB
When the ISO downloads, open that in File Explorer and then run Setup.exe
Select the Upgrade option to run the repair upgrade.