A few comments after a quick scan through the code:

• I'm not sure how you are supposed to install this as a Win32 service (The supplied subs, "Remove", "Install", etc. don't seem to have anything pointing to them).
• Some of this code looks like it should be refactored: e.g. the code for minutos and horas are almost identical, and with some re-writing you could have much simpler code.
• You're not useing strict or warnings!
• The name of the crontab file is hard-coded in the script. You should probably document that!
• (And you should probably document that the names of the days are hard-coded in Spanish, and where to change them. If you've not learned how to use POD documentation try reading the perlpod manpage, very useful!)

Hope that helps.

Cheerio!
Osfameron
http://osfameron.perlmonk.org/chickenman/

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