Sounds like a very poorly written theme - mysql_num_rows isn't really meant to be used in WP, that's what stuff like $wpdb is for!

I'd be careful with a badly made theme - it's highly likely that there are security issues with it..

But, if you want to continue with it, can you post the contents of C:\xampp\htdocs\website.com\wp-content\themes\biznez-lite\SketchBoard\functions\modules\nbar\notificati onbar.php and point out line 78?

Cheers,
Michael

"Warning: mysql_num_rows() expects parameter 1 to be resource, boolean given in C:\xampp\htdocs\website.com\wp-content\themes\biznez-lite\SketchBoard\functions\modules\nbar\notificati onbar.php on line 78"

This is an error in my_sql, Please double check your codes in line 78 and will see what happens. And also check your database. And lastly, restart you XAMPP before you debug. Hope this will help you