Question: For some reason, my Win98SE has lost the ability to Show/Hide the Desktop Taskbar
Answer: Can you see a thin grey bar along the bottom edge of your screen? The best way to look for this is with all of your applications closed or minimized as otherwise the bottom grey bar of your application just looks slightly thicker than expected and that makes it hard to spot. If you do see a thin grey bar then your taskbar is still there, its just been reduced in height so that you can't see its contents.
To fix this, move your mouse cursor over the grey bar. It should turn into a double ended arrow. Now click and drag upwards and your task bar should reappear.
This article written by Stephen Chapman, Felgall Pty Ltd.