Last night I updated free Avast to version 7.0.1456. This morning, I cannot run IE7, Chrome, or MS-Outlook, except in safe mode. However, I can run normally, an old Mozilla browser I used for school. I can also run Skype. And, I can access websites from my older machine with IE6, which does not have 7.0.1456. So, while I can't be sure, the new Avast version is suspect.