|Internet Explorer 6 SP1 was the final version that runs on Windows 98. Get it here:|
If you are in any doubt about it's compatibility with Windows 98, please scroll down to "System Requirements" and you'll see that Windows 98 is listed.
Please be aware that the problem you're having may not be related to Internet Explorer at all. You may have a hardware problem with your internet equipment or there may be a problem with your internet provider.