Lucas, This is an English language forum. I cannot read Spanish nor does www.freetranslation.com[^] or babelfish.altavista.com[^] make any sense of your post. I think you are asking how to detect the presence or non-presence of the NET framework at installation time? If you can re-post in English we'll see what we can do to help. ...Steve 1. quod erat demonstrandum 2. "Give a man a fish and you've fed him for a day. Teach him how to fish and you've fed him for life." I read that somewhere once :-)