Upgrading avast

I downloaded an update to avast. I now get the message " windows could not upgrade from file %1 to %2"
I am running me avast build 4.1.418. If i restart the system i no longer get the message. once I turn the system off, the next time the system starts I get the same message. I have re downloaded and installed avast but no change. Any suggestions??

If you answer the questions here maybe someone will help you.

http://forum.avast.com/index.php?board=2;action=display;threadid=5610

Delta.

I am running version 4.1 home edition. I saw no difference on using the control panel. The message only occurs when the system starts. if I restart the system, I do not receive the message. If I turn the computor off. The next time I start the system i get the message, This is before windows gets started. Thanks

Hello-
Try this:
http://support.microsoft.com/default.aspx?kbid=283069
Google is your friend.
-max