There are a number of things that could be causing your issue. Here are a few things to start with.
First, have you tried installing the newest drivers for the dial-up modem? They should be available at the modem manufacturer's website.
Next, because a virus or spyware could be present, please start by clicking on the link below and running the free online virus scanner that it provides. AFter that, download, install, update and run the free spyware removal tools listed below. Delete all infected files and spyware that are found. (BE AWARE, some types of "freeware", such as KaZaa, may cease to function if they are dependent on spyware to operate. Still, it's safer to find new "freeware" than to continue with the spyware.:
Trend Micro's Housecall Online Scanner
Spyware Removal Tools
Ad-Aware 6 Spyware Removal Tool
?Spybot Search & Destroy? Spyware Removal Tool
AFter using the above programs, and if you still are experiencing the problem, you can try repairing Internet Explorer 6 by opening the Control Pane, double click on "Add/Remove Programs", find the Internet Explorer 6 and Internet Tools" listing, highlight it, then click on the "Add/Remove" button. Another window should load, giving you the option to "Repair" IE 6 SP1. Do so.
Have you ever tried to install a different, secondary browser? Netscape, Mozilla/Firefox, Opera, etc.?
Hope this helps and let us know what you find.
My Dell latitude laptop will connect through modem, or ethernet but Internet Explorer seems disconnected for all but one dial-up connection that is running at 9.6. Another dial-up connects at 44.6 but won't bring up the pages and same is true of Ethernet connection. I get a cannot find server message. I have Windows 2000 and IE 6 I think, the page with the version number is blank! I sure would appreciate any ideas about a fix.