Windows Defender will stop when the computer starts

Windows Defender goes off when the computer is started and occasionally when the computer is running. I bring up the Control Panel icon, click on restart and restart the program. I had this problem for a week but have not added new software for a fortnight. Everything ran happily until a week ago. I am running Windows Vista Home Basic on a Packard Bell Imedia 3312 UK computer, purchased in April 2009

Are you by chance using AVG 9.0 for your antivirus package? This version of AVG 9 automatically extinguished Windows Defender. Microsoft® Security MVP, 2004-2009

Tags: Windows

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