Have you checked your IE Add-ons to ensure that avast! Online Security is not enabled?
Not sure who this is directed to. But Craig suggested that I untick the AOS box during a custom install. That didn't work. If that's what you're referring to...
I'm not sure I know what is an IE add-on. I don't recall adding anything. I always uncheck whenever an installation wants to add a google bar or things like that. As far as I know, I'm fairly clean in that regard. But maybe I have something I don't know about???
Kurt
Directed to you. Avast installs the Add-on, not you.
Humour me. Just do it.
Open IE > Tools > Manage Add-ons
Are there any lines there for "avast! Online Security?" If so, is the status "Enabled" or "Disabled"? If it is "Enabled" change it to "Disabled". Right click anywhere on the entry and select "Disable" from the drop menu.
Then close and restart your browser and see if your problem persists.
If the status is "Disabled" or the entry is not there, then that's not the problem, and I'll butt out.