I would report it to Avast and let them deal with it!
Note: In your original post you stated: "Avast is popping up Mal:url, process - c:windows/explorere .exe URL alerts the minute I open a browser."
The bold face is mine and I am assuming the extra 'e' on explorer was a typo. The correct file name is explorer.exe. -- When angry count four; when very angry, swear. Microsoft MVP/Consumer Security 2005-2011 Gladiator Security Forum