Index: wp-admin/includes/class-wp-themes-list-table.php
===================================================================
--- wp-admin/includes/class-wp-themes-list-table.php	(revision 22236)
+++ wp-admin/includes/class-wp-themes-list-table.php	(working copy)
@@ -76,7 +76,11 @@
 			// else, fallthrough. install_themes doesn't help if you can't enable it.
 		} else {
 			if ( current_user_can( 'install_themes' ) ) {
-				printf( __( 'You only have one theme installed right now. Live a little! You can choose from over 1,000 free themes in the WordPress.org Theme Directory at any time: just click on the <a href="%s">Install Themes</a> tab above.' ), admin_url( 'theme-install.php' ) );
+				if( file_exists( get_theme_root().'/'.get_option( 'current_theme' ).'/index.php') ){
+					printf( __( 'You only have one theme installed right now. Live a little! You can choose from over 1,000 free themes in the WordPress.org Theme Directory at any time: just click on the <a href="%s">Install Themes</a> tab above.' ), admin_url( 'theme-install.php' ) );
+				} else {
+					printf( __( 'Currently there are no themes installed which probably means that your WordPress installation is broken. Please install one to restore functionality. Click on the &#8220;<a href="%s">Install Themes</a>&#8221; tab and you will be able to browse or search for themes from the <a href="%s" target="_blank">WordPress.org Theme Directory</a>. Themes in the WordPress.org Theme Directory are designed and developed by third parties, and are licensed under the GNU General Public License, version 2, just like WordPress. Oh, and they&#8217;re free!' ), admin_url( 'theme-install.php' ), "http://wordpress.org/extend/themes/" );
+				}
 
 				return;
 			}