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This is some info on the avant browser:
"Full IE Compatibility: Avant Browser comes with all Internet Explorer functions, including Cookies, ActiveX Controls, Java Script, Real player and Macromedia Flash. IE bookmarks are automatically imported into Avant Browser.
Is Avant Browser a secure browser?
Yes, Avant Browser is secure. Since it’s based on Internet Explorer, Avant Browser IS AS secure as Internet Explorer. "
This is directly from the Avant web site. It would obviously be susceptible to quite a few of the same exploits as IE. I especially hope you’ve disabled activex 