I have Windows 98 Second Edition!
Unfortunetly, the task manager is not located on the taskbar on Windows 98 Second Edition. Instead, it can be accessed by tapping "CTRL+ALT+DEL" once, very quickly of course. This old task manager doesn't have an application tab. Everything is all bunched up together.
End all the processes. Apart from "explorer" and "systray". These are your important programs. Make sure you don't have any documents, games, or programs running.
Perform the Scandisk scan.
Finally, defragment your hard drive.
Your computer may be affected by spyware. In short, these are undesirable programs that run in the background without your permission. If you want to, you can use a program to delete the unwanted spyware.
Don't worry. I don't think you've got any spyware. I think you've just installed too many programs on your hard drive.