I donwloaded the free avast program last week, I was able to connect to internet and was happy with avast so I decided to upgrade to avast version 4.8 professional. I now can no longer connect to the internet, and receive the error acast!: The AAVM subsystem detected a RPC error. After reading the forum and seeign taht maybe I had some residual of norton I tried to uninstall avast through add and remove programs and it tells me a setiface error has occured and the reinstall. Well can't connect to internet so...please help I am running windows xp and connect using netgear router.