[MiKTeX] Babel/portuguese

[<joa...@ne...>]

Hi
I´m writing a document in Portuguese usink Miktex in Win98. I´m loading the
babel package with the comand

usepackage [portuguese] {babel}

 but  when compiling I get a warning:

"No hyphenations paterns were loaded for the language 'Portuguese'...

and in fact the hyphenation is not correct in the document.
How can I solve this?

Thank you.
João Esteves