Avast Pro with Outlook Plugin Error

Hi all, I am just getting to grips with the Avast product range and I must say it knocks spots off Norton’s equal… anyway, I am running on a SBS2003 server with clients on XP & 2000, when I install the client program and restart the machine some of them come up saying, upon starting outlook 2003, that the Outlook plug-in could not be installed & started please click OK, if you click OK the plug-in loads and all is ok, does anyone else have this problem and could someone say why some machines are affected like this and some are not. I have tried reinstalling outlook over the top but does not make any difference.

Regards in advance for any help given, John

Maybe you could receive proper help if you post in the server board…
http://forum.avast.com/index.php?board=8.0