its very easy. do the steps: Start --> Control Panel --> Add/Remove Programs.
Everything that concerns MSN, like Windows Live Essentials, Messenger + Live etc.. just click on Change/Remove one by one on all those related to MSN.
You get 2 options Uninstall or Repair. Click on repair. The updates will b done. The only thing is that with the Messenger Live+ Repair you will lose all your configuration on your MSN. After that, reboot. Then all must work fine! Reconfig your MSN settings...
Hope it helps!