IE7 says NO!

Hello once again. I'm having problems with any browser besides Firefox. When I try IE7 i get"Internet Explorer cannot display the webpage". Ive googled and googled and visited MS trouble shooting with no avail. I don't know anything about proxies or IP addresses and that might not even be the problem...i dont now. The MS troubleshooting guide tells me to run the "Diagnose Connection Problems" in the tools menu. This option is not in the tools menu on my computer. So i go to work download the newest version of IE7, install it on my work computer and viola..its there. So i take this same IE7 installer home and set it up on my computer once again this option isn't available under the tools menu. And it not that IE7 wont visit certain pages...it wont visit any pages...at all. If anybody could help me thank you very much in advance.

 

go into firefox and then tools internet options delete cokkies and delete file and that should be it