I can't login from my xampp localhost

Hello everybody,

I’m new here. Just installed Xampp localhost on my computer and looks like it is running perfectly. I can see my blog but when I try to access to the admin panel, I cannot login with the user and pass. Is it the same user/pass that I used to login into wordpress.org, right? Because it is obvious that I have been able to login here since I’m posting… I try to get the password by email but I don’t get anything. I changed the pass but nothing either. Somebody could help?

Thanks in advance
Jose