First of all, thank you for your quick answer, but...
I set nameservers on my domain, but I continued having problems. However, this morning everything worked correctly.
In the other hand, when i try to install a component or a plugin trough installer of from a directory on my ftp, I had having several problems. Many times i received the next message
"The page you are looking for is temporarily unavailable.
Please try again later."
I could install poca gallery and jce editor, I also could copy diferent templates, but I have had problems with poca module and jce plugin. Are there any problem with host???
Thank you very much and sorry for the inconvenience.