White wp-admin page

I have a wordpress site http://www.migranviaje.com , i installed the creative theme, then i filled with information, and when i try to login again i am not able to see the login page trough http://www.migranviaje.com/wp-admin
i deleted the theme by deleting the folder named creative and i was able to acces to the wp-admin page, then i reinstalled the them and again, as soon as i try to acces to wp-admin page i only see a blank page. i really want to use this theme. i also noticed thet when i update some info in the dashboard it goes to a blank page, i just hit back and get into dashboard again, and also when i choose to lopgout it also send me to a blank page, and the only way to really logout is closing the window and deleting all cookies.

Please help me