My PC has suddenly started to reboot now and again, particularly if a game is being played ("Board" type games), but has done it othertimes as well. I stopped the windows search sytem as it was logged several times in the error log. However it still resets and also, after switching the socket on I don't have to press the PC button as it is starting on it's own. The latest log at reset shows Service Control manager-the session launcher failed to start. I have all the latest updates and use Norton Internet Security 2010. I replaced by Norton 360 in January with Kaspersky but returned to Norton in March - just in case this helps?