Hi Juan,
Thank you for posting your query on Microsoft Community.
I suggest you to go through the steps provided in the link given below and make sure that you have followed the exact steps as in the link when you were creating an account.
http://windows.microsoft.com/en-us/windows/create-user-account#create-user-account=windows-8
If you have done the exact steps, then perform disk cleanup to remove unwanted files and folders.
Here is the link which will help you in performing disk clean up:
Get back to us with the status of the issue so that can help you further.