problem with avast free

hello i am using avast free but recently i have installed k9 web protection parental control but when ever k9 blocks a web site which i have ordered it to be block avast just pops up and says that malware has been detected. what should i do? or can you suggest any free good parental control software which goes along with avast.

thank you.

or can you suggest any free good parental control software which goes along with avast.
openDNS....in my opinion the best, one reason is that ii is not installed on your computer so it does not conflict with anything you sett it in your router and every computer is then protected

openDNS http://www.opendns.com/home-solutions