HI,
Exactly the same problem,my configuration : xp pro sp3,comodo firewall,and after the second reboot after the update to the new version no more browsing possible (firefox,opera,internet explorer) and if i disable webshield browsing are now ok. That is very strange cause yesterday all works fine juste after the upgrade to new version,this morning same all is ok and this afternoon after the upgrade of K-Lite codec pack and one reboot,this problem appear.
Little precision,i have try to uninstall Avast and reinstalled,and it work fine but after one second reboot ,the problem reappear.