Some program is trying to dialup. Could be any program you recently installed, or spyware. So you've got to find out what it is. Some methods:
1. Go to the Startup Tab of MSCONFIG (start/run/msconfig) and see what programs are running at startup. One of those must be dialing. Make a note of the current status. Then one by one, disable a program, reboot and see what happens. At the end of the experiment, restore every setting to what it was (except the culprit).
2. Press ctrl-alt-del (or run msinfo32, list of active processes/tasks) when the dial-up screen appears, and see what programs are running. One of those must be the program initiating the request.
3. Install a firewall, let the program dial and make a connection. Then the firewall will ask if you want it to allow to access Internet. So say no, and you know which program it is.
Once, cleverly sleuthing, you know what program it is, come back for advice on what to do.
For some strange reason,all of a sudden my dialup connection is connecting at Startup and randomly during the day,
I have tried everything to figure out why and can't.
Any help appreciated, running Windows 98.