Live Messenger and lsass.exe

Hello,


I installed Live Messengertoday and after logging in, (or during the logging
in final process before it gets to load your contacts),
lsass.exe goes to 100% CPU usage and nothing can stop it apart from ending
Live Messenger task from the Task Manager.

I just tried signing in with a completely new MSN/Live/Hotmail.com address,
but the same thing occurs... Same pb with Live messenger, but not with 7.5...

Is there anything one can do? I have WinXP SP2, no external devices plugged
in...


Regards and thanks in advance.