1. Use another browser.
2. Since you didn't reveal which Internet Explorer, I'm left to guess if the reset settings button was used. Read http://support.microsoft.com/kb/923737
Also, be sure your choice of PROXY is correct. Most often the right choice is no proxy.
Everything was fine, but then, everytime now I try to access Internet Explorer, I get one of the following messages. Internet Explorer cannot display the webpage, or, The address is not valid. I know I have connection as Outlook still receives my email, Norton is still receiving updates, but anything that has to open a IE window will give one of the messeges. I have XP Pro with all updates on a Dell Vostro 1510. I run Norton 360, which finds nothing, I've ran Malwarebytes, nothing. I need my laptop back and really don't want to have to format and reload everything. Please help.