Yahoo! Messenger is an instant messaging, chat and VoIP (Voice over Internet Protocol) application. It allows people from all over the world to send messages in real time, send SMS texts and call phones, make video and audio calls to other computers. The application also notifies you when you receive new Yahoo! mail. However, if you have decided to try another, similar, application you can uninstall Yahoo! in just a few mouse clicks. Keep in mind that no matter how useful Yahoo! Messenger or any similar applications are this is one of the primary paths for spyware and virus infections.
Go to the "Start" menu and click "Control Panel."
Double-click the "Add/Remove Programs" icon (Windows XP) or click "Uninstall a program" under "Programs." (Windows Vista and 7.)
Scroll through the list of available programs, click "Yahoo!Messenger" and then click "Remove" (Windows XP) or "Uninstall" (Windows Vista and 7.)
Follow the prompts to uninstall the application and restart your PC.