Please come back and redo in English

First things first, you have to use English to comply with LQ rules.

you should reduce the size of windows partition first, you can do it with GParted. Don't know if ubuntu installer can do it.

yeap: the installer does it automatically (Just choose "Install them side by side, choosing between them each startup" during the installation partitioning process, in this screen: http://www.ubuntu.com/sites/default/..._04_medium.jpg)

Por favor, es necessito de hablar solo en Ingles a LinuxQuestions.org.

Contrary to indication in post #2, you cannot use any language you want here. LinuxQuestions.org is an English-only forum - please read the second-to-last rule on the LQ Rules page here: http://www.linuxquestions.org/linux/rules.html
This makes it much easier for moderators & admins to do their jobs.

This discussion shall continue in English only, please. If any parties to this discussion are unable to communicate effectively in English, there are very good, free, online translation tools available, such as Google Language Tools, which have been shown many times to be quite adequate for translating posts on LQ.

Thank you / muchas gracias,

Sasha

Sorry for not writing in English.
In step 4, "Prepare disk space", there are only two options:
- Erase and use entire disk
- Specify partitions manually (advanced).
In step 5, only appears unapartición 60 GB and do not like changing the existing partition without deleting Windows XP Home edition.
Please provide assistance

Maybe you dont have free space in the harddisk to do it (at least 8GB or more need to be used by the ubuntu partition)?

If not, an "unclean" windows shutdown can do it... try run that in windows before installing:
if that not solved the issue, try to ask for support in the http://ubuntuforums.org (this tread may help: http://ubuntuforums.org/showthread.php?t=1515568 )

* I've seen something like it in two relative's laptops here, but i don't know exactly how to solve it... in these two cases, I've copied in a USB thumb what 'not to loose' and choose the Erase option :P