Windows Messenger Does Not Start

If you try to start Windows Messenger by using an account that does
not have administrator permissions on the local computer, any of the
following symptoms may occur:
    * Windows Messenger does not start.
    * The following event appears in Event Viewer:
      Event Type: Error
      Event Source: DCOM
      Event Category: None
      Event ID: 10010
      Date: 4/30/2002
      Time: 11:30:57 PM
      User: DOMAIN\Username
      Computer: Computername
      Description:
      The server {FB7199AB-79BF-11D2-8D94-0000F875C541} did not
register with DCOM within the required timeout.
cause;
Windows Messenger cannot identify the primary messaging service for
the current user and does not start.
1.Start Registry Editor (Regedt32.exe).
2.Locate and then click the following key in the registry:
HKEY_CURRENT_USER\Software\Microsoft
3. On the Edit menu, click Add Key, and then add the following
registry key:
     Key name: MessengerService
4 Open the MessengerService key.
5 On the Edit menu, click New, click String Value, and then add the
following registry value:
Value name: PrimaryService
Data type: REG_SZ
Value data: .NET Messenger Service
6.Quit Registry Editor.
7.restart the machine