somebody knows if an application exists to pass the messages of text of my I telephone and to be able to keep them in the computer

not yet, at least not directly

and what can i do? because i have 80 messages that i want to get out of my telephone and i don't no how

if u simply want them out of your telephone then y not delete them?
other way, as i said, is very complicated.....and u require another phone for that