I have a Windows security alert saying that my anti-virus s/w may be off or out of date - I have checked and it is neither! How do I get rid of the alert (it happened after I installed IE 7 beta! i have now uninstalled IE7)
Just somthing to check,see if your clock is set to the right timezone/date and the right time,as the updates are coded for a date/time so if the clock is wrong the update will be showing out of date.If it is then try what terryf suggested).
You could disable the anti virus security alert. First open Windows Security centre via the Control panel. Then expand the "Resources" panel by clicking on the double chevron to the right of the Resources title. Select "Change the way security centre alerts me" and untick the Virus protection option.
With avast being as automated as it is this should be quite safe, but I've got the Windows warning active and it's never posted an outdated signature warning for avast!, so you may have another problem somewhere else.