Step 1: Log out of Yahoo Messenger and exit the application.

Step 2: Go to Start menu and select Control Panel.

Step 3: Double-click on the Add/Remove Programs.

Step 4: Browse through the list in the Add/Remove Programs window and select the Yahoo! Messenger option.

Step 5: Select the Change/Remove button.

Step 6: On the Yahoo! Messenger dialog box, select the Finish button to complete the installation process.

Step 7: Restart your computer, if the uninstallation process doesn’t restart it automatically.

Step 8: Navigate to Yahoo folder in Program Files (C:\Program Files\Yahoo) and delete it.
Note: Remember that in doing so, you may lose all of your saved archives.

Step 9: Open the Registry Editor by running the regedit.exe file and navigate to the HKEY_CURRENT_USER\ Software\ registry entry, delete Yahoo, and exit the Registry Editor window.

Warning! Make no mistake about it; there ARE risks involved with manually editing the Windows registry. However, if you don’t remove registry entries associated with Yahoo Messenger, these may cause problems later such as the following.

• You won’t be able to install a new version of Yahoo Messenger (or revert to an old one).
• If you’re able to install another version after uninstalling Yahoo Messenger, some features may not be available to you.
• When you use certain features of Yahoo Messenger, it causes the IM client to hang.

Note too that not all problems resulting from not removing Yahoo Messenger components scattered through your system present themselves via Yahoo Messenger. For instance, the messenger may be working just fine but your PC is starting to slow down, thanks in part to all those obsolete and orphan registry keys left behind by your previous Yahoo Messenger un-installation.

You can solve these matters by using Perfect Unintaller , it can unintaller Yahoo Messenger completely by a few clicks.