It all began last night when suddenly my browsers couldn't reach some net addresses. I thought it was because of some updates I made that day, flash player and Firefox (upgraded to 26.0 version). After rulling that out , I thought it's the browser itself so I uninstalled it and installed it again. No luck. I thought it's maybe the internet connection. I talked with the provider and after checking I ruled that out, as well. Then I had the idea to disable avast. I use the avast freeware edition and , voila !!, the browsers worked ! I thought that avast was broken , so I uninstalled it and reinstalled it again. No luck as well. Although I can access some addresses, some I can't (google.com, yahoo.com, youtube.com etc). So bottom line is that avast made an upgrade last night that prevents my browsers to reach certain addresses. I need some help, otherwise , after 15 years I will choose another freeware antivirus. How could those people from avast screw it up now after all these years ? Did anyone encounter my situation ? I wrote to avast support team and they didn't answered yet.