wp 2.5 in a subdomain, not working

Hello,

I have an blog, wp 2.3.2 in the main folder at my host, so I can access by: http://www.solteiros.org, now I want another blog, but in the subdomain http://ex.solteiros.org.

So, I uploaded the version 2.5 of wp to my subdomain folder, and when I try to access the http://ex.solteiros.org I’m getting a redirect to http://www.solteiros.org/wp-admin, the main folder at the host.

If I upload any older version of wp, I can access the install file in ex.solteiros.org, I’ve tried to upload an .htaccess but the problem continues… Any one know how to solve this?

Thanks,
RA