error 500 when trying to access install.php

I´m trying to install wordpress on my website, http://www.badmood.net, hosted in a Doteasy hosting server.
I´ve uploaded all the files to the folder http://badmood.net/blog/ and i edited the wp-config.php with all the info needed.
Before I create the database on mysql server, i was able to access the install.php on the server using firefox.
As i had no database created, i was getting the message:

Can’t select database

We were able to connect to the database server (which means your username and password is okay) but not able to select the badmood_net_-_blog_db database.

This is normal. But then when i created the database with the name “badmood_net_-_blog_db” i started having an error 500 message, when trying to access http://www.badmood.net/blog/wp-admin/install.php with the firefox.

Can annybody help this newby?
Thanx