Are you using some kind of firewall?
avast! uses an HTTP proxy server called Web Shield
for scanning all HTTP traffic. In simple words it scans all the data before it gets downloaded n your browser. If you do not allow avast! Web Shield to access internet and act like local server then, you wont be able to access web sites in your browser.
Two possible solutions - Disable Web Shield
component in avast! settings, or allow ashWebSv.exe
in your firewall.
For more information : http://www.avast.com/eng/webshield_issues.html
Edited by Romeo29, 23 August 2009 - 10:06 PM.