My WIndows security center is stating my Virus Protection is out of date! I just purchased Avast Virus for a year last month. When I turn my computer does say something about the memory not being able to update not sure how to fix that. but down at the bottom where the avast icon is it is saying that my system is secure. Not for sure what to do. I really wish there was someone I could talk to, instead of just here.
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