If you frequently get illegal operations or invalid page fault error messages in Windows 98, there is a utility that Microsoft includes in which you can use to troubleshoot, find the cause of, and correct the errors to prevent yourself from getting them again. It also logs all errors so you can report them to Microsoft or you software program's vendor so that they can fix the problem. To start Dr. Watson, Click on the Start button on the Windows Taskbar and select Run. Type in 'DrWatson' and click OK. An icon will appear on your Taskbar tray. Double-click on it to view detailed information about you system.