Juan, you can use Messpatch instead,
http://mess.be
OK guys, a friend of mine did this and now the problem is now solved for her.
first of all, Uninstall Completely your Windows Live Messenger and Messenger Plus Live! versions.
then Reboot your computer and then do a CLEAN install of both, Messenger Plus! Live and Windows Live messenger.
and for Spanish Speakers, i suggest you to go for spanish help at
http://es.msgplus.net/foro/ (Official Community)