As of just a day or so ago, every time I try to install a new brand of Anti virus, I'm unable to log on to the internet. Meaning, all is good - I can log on to Google.com, or visit any web-page. Then I install a free demo of Avast, and I get an error message from both Firefox and IE. Same thing goes for Kaspersky. Somehow something is blocking something. Is it the Anti-virus program blocking Firefox? Windows 7 firewall blocking the Anti-virus? What exactlyy is happening?