Belong into software, Operating system.
The task manager is absolutely not the place nor the tool that you need.
If it's a useless programm/application, you need to uninstall it. It's the only way to definively get rid of an unwanted process.
If you want a less hard way, just set that programm NOT to start with Windows.
You should NEVER disable Windows update.
If you kill a process in the task manager and it immediately spring back, it mean that it is a REQUIRED task for something. It's thus absolutely NOT useless, even if you can't figure it's use.
When you install ANYTHING, you should never use the so called "Default" install.
Choose the personalised or custom install.
If you are asked or offered any additional component, you must DECLINE them. None of the additional things proposed have any utility, they are foistware or parasitic side install and changes.