>>>I have Avast AV running on my PC. I can shut it down (temporarily, like for 10 minutes). But the server AvastUI.EXE is still running. And when I try to End it in the Task Manager, I get "Access denied"
>>>How can I stop this service?
>>
>>If it's a service you should be able to start/stop and/or change its startup type in the Services manager.
>>
>>Otherwise http://www.tomsguide.com/forum/244983-49-kill-avast-process
>
>I disabled program AvastUI.exe in the WinPatrols Plus. And it shows as Disabled. But when I restarted my PC, this service still shows in the Task Manager. Stubborn :)

Did you check local services and verify if you can change its start mode to manual?