Problem for AV incomparable on Vista SP2

To Avast team I found problem is any AV incomparable with Vista SP2 or some Last update on SP1
like …
1.Windows alert not found anti virus program ,but have AV program installed.

I sure for this problem.

Are there any processes visible in Taskmanager starting with “ash…” and “asw…”? This would indicate Avast is working. Is the blue ball in the system tray? If you left click on it and select “standard shield” does it show the scanned count?
All these present indicate Avast is operating correctly, in which case you may need to reset the security centre, post 5 by yours truly.
Here’s another reference.

Sometimes, Windows Security Center stop 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

I sure is AV running.
Problem is after update SP2 and no other scanner program at startup ,
I use Windows firewall only .

After problem my computer disable alert.

Really I am not afraid about this problem,but if program common running is best.

Thank you for help me.

Did you reset the security centre?
(Not a bad idea. Not difficult to do.)