I've had similar issues with Windows 8 updates on my laptop. It would update, pc restarts fine but then the moment I connected to any network all hell would break loose. I wouldn't be able to open any program or window, I could move the mouse around but nothing would happen if I clicked on anything. I'd have to hold down the power button and turn it back on with the LAN cable unplugged and wifi turned off and then I'd be able to use Windows again.
Ended up uninstalling all the updates and turned off automatic updating because it was such a mess up. I'm still not sure which update is causing it but I refuse to update now :/
Ended up uninstalling all the updates and turned off automatic updating because it was such a mess up. I'm still not sure which update is causing it but I refuse to update now :/