Last night (02/19/14) I went to bed & left my Vista Home Premium laptop on which I've done several times before only this time ,next morning when I moved my mouse to start surfing, no taskbar. No, I don't have it set to auto-hide,either. I used Ctrl-Alt- Del to bring up the Task Manager but was unable to see how to reboot it using the Task Manager. I now can't remember what I did, but I got to a blueish screen giving me options on whether I wanted it to hibernate,switch user,etc, etc. I clicked on one of them, clicked my name & it rebooted. I don't know how to find the Event viewer if that is what I needed to look at, so , what could of caused this? I know his laptop aint the best, but I'm glad it works as good as it does.