Some 30 minutes ago I performed an update threw Windows Update, everything installed fine and I continued to use the computer normally. I shut down the PC to watch some TV, and after turning it on again, all kinds of things stopped working. Windows Update won't open after clicking it;Right clicking 'Properties' on 'Computer' does nothing;Every time the computer starts, Action Center tells me to turn on Windows Defender and Security Essentials, even though Security Essentials is running, with the green logo meaning no problems;I tried to do a System Restore, but I get an error "System Restore does not appear to be functioning correctly on this system."(0x80042302). What the hell? It happened after the last windows updates, which I can't inform what was updated since Windows Update won't open at all. There may be other problems, but for now that's all I found out. Any help is appreciated.