试试这个,我没有试过
Exit MSN Messenger completely.
Click Start, the Run, type regedit and click OK.
Navigate to:
MyComputer\HKEY_CURRENT_USER\Software\Microsoft\MSNMessenger
Click (don't double-click) the MSNMessenger key. It should simply highlight the name.
Go to the Edit menu and click Delete. Click Yes to confirm the operation.
Install MSN Messenger 6 and sign in!