Any Idea as to what caused the "Segmentation Error"...
However, I would recommend you to download the latest version of GAIM
http://gaim.sourceforge.net/downloads.php (an Instant Messenger Client like Yahoo!)..(Download 1.5 ..not the beta version!)
The GUI is quite simple to use "according to me". If you find it difficult to use, let me know, I'll get back to u for helping u out!
And as far as yahoo messenger is concerned, find out if you can use the rpm -e command with other options to uninstall it!