You don't say much about your system, so we can only guess, but here are a couple;
1] Proxy server. Open IE, goto Tools > Internet Options > Connections tab. Click the LAN Settings button and make sure there are no "Proxy Settings". If there are, remove the ticks and then tick the "Automatically detect settings".
2] Add-ons. if the above fails, look at my post below about Add-ons;
When I try to get on the net - Yahoo, Google, or whatever, I get the message "Internet Explorer can not display the web page." I have been on the phone with Microsoft, Asus, and Norton. My Norton has been uninstalled. I do not know who my router is.
Can you help, please