First of all, make sure you have not mistakenly signed into MSN on another computer. This could happen, if you select the option to remember your username and password for MSN. When you connect to the Internet, MSN automatically signs in using the username and password that is saved.

If you've made sure that you have not signed into another computer, you might be using Windows XP. Windows XP comes with Microsoft Windows Messenger installed by default. This remains on the computer even after you've installed MSN Messenger.

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If Microsoft Windows Messenger and MSN Messenger use the same login username; the program that starts last will cause the previous program to sign out, displaying the above message. You can configure Windows Messenger to stop signing in automatically by following these steps:

 Start Microsoft Windows Messenger.

 Select the "Tools" menu and click on "Options".

 Click on the "Preferences" tab.
 Click on the "Run Windows Messenger when Windows Starts" check box to remove the tick mark in the box.
 Click "OK".

 If you want to run Microsoft Windows Messenger and MSN Messenger together, make sure you use different usernames.