An easy way to stop programs running at startup from windows 98 is to use the MS configuration program (MSCONFIG.EXE)
To run it you can click on start | run
Then key MSCONFIG.EXE and click OK.
On the dialog box that opens, click on the startup tab.
I would check the startup tab first.
You uncheck anything you don't want to run.
Put a check next to anything you do want to run.
Click OK or Apply.