This post will show you how to reset proxy settings. Malicious software may change Windows Internet Explorer proxy settings, and these changes can prevent you from accessing Windows Update or any Microsoft Security sites.

Reset the Internet Explorer proxy settings back to defaults using this Microsoft Fix It available at KB2289942.

Certain strains of malicious software can prohibit a computer from being able to access Windows Updates or Microsoft Security Sites. In such a case you may need to reset proxy settings in Internet Explorer.