Hi all. I just installed WFC 3.0 on a non-fresh Windows 7 x86 Ultimate computer. The only security app there is Avast Free Antivirus 6.0. After installing WFC I could browse normally. BUT after chosing "Medium Filtering" I couldn't browse anymore. I had to set "No Filtering" (Firewall disabled) in order to be able to browse. I had to uninstall WFC with the option to restore previous WF settings. Maybe somebody could tell me what's wrong with it?