<rant> I came home to find my PC that was running XP when I left the house sitting there running Vista. When I left the house, the PC had a bunch of unsaved work on the screen including a particularly useful Virtual PC image. What happened is that whilst I was away, Windows Update decided that it would install some updates and then it decided that (of its own volition) it would go ahead and reboot my PC in order to apply them (presumably because I wasn't there to tell it "NOOOO! Don't ever do that!"). Vista is my default OS on that PC so when I get back, Vista has booted. When I reboot back into XP, it says "Oh, whilst you were away I've rebooted the OS to apply an update". I find this kind of thing infuriating . Where's the button that says "Don't ever, ever, ever do that on my PC no matter what - it's my PC and I'll decide when to reboot it". If there is such a button then why the heck isn't it the default setting?!?! If you're someone who builds software - never, ever, ever reboot the user's PC without...