WordPress Blog Not working

I am trying to install the blog on my site with url as http://www.xyz.com/blog. But I am unable to get wp-admin/index.php page to enter the details. I am getting the below listed error whenever I try to access the page of my blog

http://www.current_site_domaincurrent_site_pathwp-signup.php/?new=

Expecting some help at the earliest.