Really Weird Problem

So I was looking for a solution to turn my computer on and off automatically. I went to and search “shut down” and as soon as i hit enter, everything closed, and shut down. I thought it was a coincidence that I just searched that since I was downloading updates at the same time. So I tried it again. Same thing. The computer does that itself when I search shut down on I looked at the processes running, and it is nothing out of the ordinary. I also typed “shut down” and hit enter outside of FF but the problem is unique to that website. Any ideas?
OS: Vista Basic

Edit: The computer restarts itself in any browser when downloading
This is REALLY ticking me off, the computer has restarted itself 7 times this morning