Windows Live Messenger 2009If Messenger doesn’t remember your e-mail address or your password, then you have installed both Windows Live Messenger and Yahoo Messenger. You have to revert a registry setting that has been changed while Yahoo Messenger was installing. Then you will be able to store your sign-in credentials again. Here is how it works:

  1. Open the registry.
    • Windows XP: Click Start, Run. Enter regedit, then click OK.
    • Windows Vista: Click Start, type regedit into the search box, then press Enter.
  2. Now open the folder User Shell Folders. Use the following path: HKEY_CURRENT_USER/Software/Microsoft/Windows/CurrentVersion/Explorer/User Shell Folders.
  3. Now, a list with several entries appears on the right side. Double-click AppData.
  4. At Value, enter the following and click OK:
    • Windows XP: %USERPROFILE%\Application Data
    • Windows Vista: %USERPROFILE%\AppData\Roaming
  5. In Windows Vista, do the same for the entry Local AppData with its value %USERPROFILE%\AppData\Local.
  6. Close Windows Registry Editor, and reboot your computer.

Source: http://messengermaximal.spaces.live.com/blog/cns!40F43EC9BA81D814!8064.entry

Related posts:

  1. Messenger problems: Cannot sign in, no error code
  2. Messenger problems: Solution for Messenger sign-in error 8100030d