Do you have any software installed from this company:
http://www.ascentive.com/ ?
If so, remove it from your system, using add/remove programs. It is crapware. See
this link. and
this link.
Then I recommend you download an antimalware program for your system and scan it to check for other possible problems. Unfortunately, most of my recommendations won't work on your system. SAS is very highly regarded, even for newer systems, and
available here. You could also try
this or
this. Both are excellent companies. I'm not sure the BOClean download will work for Win98 any longer, as they just recently discontinued it as a standalone app and you must now install internet security. If you do so, make sure to leave the AV portion turned off so it doesn't conflict with your current av.
Anyway, choose one and run a scan to check for other problems, and remove any that are found.
I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take just a moment to rate this post....thanks!