Well I was finally able to get my IE 6.0 browser problem fixed!
First off, I learned that Yahoo Chat 2.0 is only supported with IE, not Netscape or on Macs. It doesn't appear to be supported on Opera either. So I decided that I had to get my IE up and running again since I prefer Chat 2.0 to Java. Actually I like IE better than Netscape all the way around for that matter.
As for how I fixed my IE, I searched the Microsoft Knowledge database and the only think I could come up with is that I'd have to essentially reinstall my IE altogether. After reading up on what all was involved in doing that, I realized it wasn't a simple matter or using the Add/Delete feature in the Control Panel.
Fortunately, before I attempted to do a nondestructive system overwrite (which may or may not have solved my problem), my system restore disk prompted to me that if I had a Windows problem like I was having, that I might be able to use the 'System Restore' feature in my Windows XP Home edition instead of doing a system overwrite. I never used the System Restore feature before but it was easy enough to use and it worked like a charm! I was able to restore my system back to a few days before my IE quit working correctly. I still don't know why my IE quit working correctly but I do know that it happened one evening while I was a logged into the Yahoo chat rooms.
To access the System Restore feature, go to 'Start', 'Help and Support' and do a word search for: 'system restore'. When it comes up, just double click on, 'Run the System Restore Wizard' under the 'Pick a Task' column. Then choose the 'Restore my computer to an earlier time' option. That's it! Real easy!
Hope this helps some of you that run into a similar problem like mine.