have you checked this situation with temporarily disabled AVG components (one-by-one) to find possible culprit? Disable also AVG Security Toolbar in Internet Explorer.
Then please provide us with names of other used protection applications, toolbars and firewall.
Since I downloaded the free edition of AVG internet explorer will not open completely most of the time and in order to close it I have to use ctrl,Alt, delete. This happens mostly when I click on a link in an e-mail, but it also happens frequently when I want to surf the internet. I am using Windows 7 on a Dell laptop. Does anyone have a solution?