There is a nasty Virus affecting windows computers causing them to shutdown. If you are running Norton antivirus software go to this page and download the very latest update. http://securityresponse.symantec.com/avcenter/download/pages/US-N95.html After downloading the update do a virus scan. If the computer shuts down before you can download it, call your ISP and have them block the port. Calvin Smith Louisville, Ky.