Here is additional information on how to invoke a mini-dump file: http://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=71.
Please, zip and upload the C:\Windows\Memory.dmp file to this anonymous ftp server and name it uniquely: ftp.avast.com/incoming or email it to pk (click on the email button under his name in this thread). Avast will analyze it and respond back to you in this thread or to your email. Thank you.