Yahoo! Messenger has been around since 1998, and it has been through many changes since then. If you choose to download a new version of Yahoo! Messenger when it is released, you may decide you liked your old version better. Fortunately, websites like oldversion.com, oldapps.com and old-versions.net allow you to download previous versions of your favorite programs so you don't have to be stuck with an update that you are unhappy with.
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Click "Start" and "Control Panel."
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Select "Programs" and then "Programs and Features" if you are using Windows Vista or 7. In Windows XP, double-click "Add or Remove Programs."
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Locate Yahoo! Messenger in the list of installed programs. Click "Uninstall" in Windows Vista or 7, or click "Remove" in Windows XP.
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Visit oldversion.com, oldapps.com or old-versions.net and click "Yahoo! Messenger."
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Click the version you would like to download, and follow the instructions to install the old version of Yahoo! Messenger on your computer.