Nr.1 this topic is from 2004
Nr.2 if you are running NOD32 and Avast at the same time, then yes you have messed up things

Multiple Antivirus Apps on One PC? http://tech.yahoo.com/blog/null/39904

Clash Of The Antivirus Apps http://www.smartcomputing.com/editorial/article.asp?article=articles/2003/s1407/38s07/38s07.asp

quietman7 reply http://www.bleepingcomputer.com/forums/index.php?s=11349ece5351ddb33ec62dc1f39aa3fa&showtopic=260844&view=findpost&p=1441638