"Windows Update Medic Service (WaaSMedicSVC) enables remediation and protection of Windows Update components. This means that even if you disable Windows Update related Services, this service will at some point in time re-enable them."
Meaning that you don't need this running at all, The problem I've been facing that I have to open task manger every time I open my laptop, because on the days I don't open task manger my laptop is as slow as it can be making work hard. So I'm here with an solution to your problem.
So WaaSMedic has a thing making it impossible to disable it from services, so we are going to use Registry Editor.
First Open Registry Editor: 2 easy Methods
1: Win + R to open run , then in the box Type "regedit" Enter.
2: In the Search bar type Registry Editor, then open the program.
Next Find WaaSMeddic in this folder.
"Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\WaaSMedicSvc"
Next Find the Value Name "Start"
Click on it so you can Modify it, and Where you see the Data Value, change the 3 to 4.

This will disable the service.
After that, you can make sure the program doesn't come back by disabling it in Task Scheduler, There are a lot Windows Service Auto turning on because Task Scheduler is programed to turn it on.
So Open Task Scheduler by: 2 easy Methods
1: Win + R to open run , then type in the box "taskschd.msc" Enter.
2: In the Search bar type "Task Scheduler" Run a Administrator.
Find the task want to disable, an then disable them.
They Should be in "Microsoft\Windows "
For the people that don't have permission from your system to use Task Scheduler.
For the people that don't permission to disable these Task even with Administrator.
To get Permission to disable these you need to Download
PsTools****and if that download link didn't work then the page is Here
Next Extract it into a folder.
After that open "cmd.exe"****As Administrator
Navigateto the folder where you extracted the tools by typing "cd C:\Users\Username\Desktop\Pstools", replace Usernamewith your username and Pstoolswith the folder where you extracted the tools.
Whenyou have navigated to the correct folder, copy the followingcommand without the quotes: "psexec.exe -i -s %windir%\system32\mmc.exe /s taskschd.msc".
Open the commandwindow and right click, choose paste. Press enter. Make sure to accept any Eula that pops up.
This is an Example of one of Windows Services that you can Disable if you want.
Navigate to Task Scheduler Library -> Microsoft -> Windows -> UpdateOrchestrator.
Right click the task called Reboot and click on Disable.
The task should now be disabled.
If you have a question a concerns make sure to notify me.