@sjw
>on a Windows machine
>only Avast as antivirus
Man, he's just looking for trouble.
What I'd do, at the very least, is disconnect any drive I have in the machine, and boot with a Linux live USB (although a live DVD might be preferable). I might also disconnect it from the internet while doing the testing.
That's because you can't disable it even temporarily, they let you interrupt for some limited time one of the several tasks it's always running, but you can't turn the program off, which is why it can just turn that function on again whenever it wants.