I had this same problem on a very old Dell the first time I rebooted after installing both the Dell Support Tool (http://support.dell.com/support/topics/global.aspx/support/en/dellsupport30?c=us&cs=19&l=en&s=dhs&~ck=mn) and a minor Windows update. I thought it might be the Support Tool, since I had no trouble with the Windows update on 2 other computers. On searching Dell's support site, I found this thread: http://forums.us.dell.com/supportforums/bo...=157240#M229202, which appears to give a solution if not an answer. If the new version of the Support Tool is causing this, I'm sure there'll be many more forums and tech support entries in a week or so. I hope this solves your problem.