Your posts are saved in the database. They (should be) okay.
First make a backup.
Rename your plugins folder to plugins-old
Then delete your theme folder (not /themes/ but /themes/themename ONLY)
That should default you back to TwentyEleven and let you back in.
Ipstenu, thanks a lot for the help, I just have a few questions more:
1. When you mean to do a backup, you mean a backup of the database file only? Should I do a backup of something else?
How do I know which file is it?
2. How can I see if the hackers have created a “user” in the database in order to loggin in?
I mean this because now I can access the http://www.antonioalcocer.com/wp-admin
but when I logg in, it appears on the top right side the name of “Howdy” as the admin, when it sould appear mine, “alcocer” as before.
3. How can I see if they have donde any change in the database structure that allows them to enter again and attack the website?
4. Would it be possible this solution to be 100% I do not have any intrusion anymore:
a. In 1and1 hosting I have created a new folder to host my website.
b. I will install wordpress latest version on this folder and will link the database to it.
c. I will install again all the stuff.
d. I will erase the older folder where I had the website running.
Really, thank you very much for your help and support!!!!!!
Best regards,
Antonio
1. When you mean to do a backup, you mean a backup of the database file only? Should I do a backup of something else?
How do I know which file is it?
Backup ALL the files on your server AND the database.
http://codex.wordpress.org/WordPress_Backups
2. How can I see if the hackers have created a “user” in the database in order to loggin in?
3. How can I see if they have donde any change in the database structure that allows them to enter again and attack the website?
We’re not there yet. Don’t put the cart before the horse. FIRST you gotta get back in, right? You can check the wp_users table and if there are people you didn’t add, then that’s a problem, eh?
Would it be possible this solution to be 100% I do not have any intrusion anymore:
NOTHING can promise 100% that you’ll never be hacked again.
Given this particular hack, if you rebuild the whole file structure you should be okay.