All of a sudden the security centre does not recognize Avast. I am using Windows XP. Any idea how to fix the problem. Security Centre is set to notify me if virus protection is not present. I have reinstalled Avast and rebooted, to no avail.
Sometimes, Windows Security Center stops recognizing your antivirus or firewall… So, check your system time and date and also http://forum.avast.com/index.php?topic=23457.msg193534#msg193534
See also: http://windowsxp.mvps.org/repairwmi.htm