Your Theme has shut me down

This is the second time I’ve tried to contact you guys. This has not been a good starting experience for me. I downloaded the dashboard, only to have wordpress tell me the file was empty. I downloaded it on another computer and was able to install it. Bad first encounter with your software. On my second encounter I tried to install one of youe themes. Your theme has shut down my site. All I get is an error message of Fatal error: Cannot redeclare bp_dtheme_ajax_querystring() (previously declared in /home/iprais/public_html/wp-content/themes/studio/_inc/ajax.php:17) in /home/iprais/public_html/wp-content/plugins/buddypress/bp-themes/bp-default/_inc/ajax.php on line 81. I cannot access my site. I cannot access the wordpress admin area. What do I do now?