I've had a frustrating weekend with my laptop.
On Wednesday night, I left it on, converting a video file so that it would stream to my Xbox360. When I woke up on Thursday, the laptop had apparently rebooted at some point during the night as it was back at the log-in screen. It then spent Thursday and Friday installing the same 4 Windows updates every time I turned it off. And when I tried to watch the video I'd converted on Friday evening, the Xbox360 couldn't find my laptop on my network.
On Saturday morning I discovered there had been a problem with the Windows updates and this rectified itself. However, I still couldn't get my Xbox to link up with the laptop. Eventually I got bored trying to restore the connection and watched the football, cricket, more football and went to bed.
But on Sunday I decided I was going to get to the bottom of what was wrong. I got to a point where I'd reinstalled the Xbox360 as an extender, but still couldn't connect to it. Following online advice I tried to check my Firewall settings... and discovered all the standard Windows 7 security features had been turned off.

The Security Centre itself wouldn't even restart.
After a lot of pissing around, I managed to restore various broken services so that the Security Centre is working and the Firewall is on again. But now the laptop can't find the Xbox on the network to reinstall it.
At which point I gave up and watched some awful Denzel Washington film. But if anyone has any advice on what my latest problem might be, or how I check to see what other damage has been done to my machine, it would be appreciated.