On Home, You can set the startup type to "disabled" for the Windows Update Service in Services (Start->Run "Services.msc"). This will disable Windows Update altogether which means you cannot check for updates either- You'd have to turn it on again first.
Only delays it all.
I've tried that and every tool and work-a-round that others claim to work!
Eventually, upon shutdown (Or even without shutting down) the pc goes into update mode and you can't do a thing about it.
Foolishly, I even unplugged the pc when this happened only to find the pc would update when restarted!
