First, sorry for my bad English, I´m Spanish.

My problem with atahualpa is that in the section comment doesn´t show the number of comments.

For example:

1. comment
2.comment
3.comment

etc.

Can i solve this problem?

Try the plugin 'Greg's Threaded Comment Numbering'

I´ve just installed and doesn´t work.

Anyway, thanks for the answer.

works for me - did you look at it's settings?
here is what I see

Still doesn´t work for me, here I put an image of the comments of my web with the pluguin "Greg's Threaded Comment Numbering":



Where is the settings where i have to look?

Umm, look under the WP 'Settings' tab....
you might try shutting off all other plugins to see if there is a conflict