v6: Error: Cannot scan the message body. Error code is 80004003. Invalid pointer

After upgrading from Avast v5 to v6 on Windows 2000 Pro SP 4 the Avast Outlook plug-in fails on incoming and outgoing emails with the error “avast!: Cannot scan the message body. Error code is 80004003. Invalid pointer. AavamCheckFile failed”.

I then uninstalled Avast, searched for and deleted all files and folders with “avast” in their name, rebooted, and installed a fresh download of the current v6 Avast. The problem is still there.

Avast v5 did not exhibit this problem.

I am the only user and am logged in as Administrator.

I searched my PC and there are no files named “error.log” or “warning.log” to be found.

Help is appreciated.

Thanks.

Hugh