Hello CookieRevised and Sunshine,
Thanks a lot for your reply.
Thanks to your suggestion, I have no more problem during Msn
startup.
Now, the Messenger Plus is running fine on Msn startup.
I think I could do better, but I tried the "simple way"
I removed completely both programs : Msn, and Messenger Plus.
Then I killed all running programs, such as antivirus software,
and I re-installed Msn, then Messenger Plus.
I guess the "recovery procedure" may have worked,
assumed I could disable antivirus and all registry-related software,
but I did not take time to try it, as I think re-installing
the programs was a simple enough procedure.
And it worked !
So, I'm very happy now using Msn & Messenger Plus, since
I have really no trouble using them
Have a happy day,
Nicolas