Thanks for using XAMPP. Please note this is not the official forum for XAMPP products.
Did you install the WordPress module on top of your previous XAMPP installation or did you install the entire Bitnami WordPress stack containing its own Apache server? It looks like the Apache server in XAMPP can't run because there is another process using port 80, that's why I think you may have installed the Bitnami WordPress stack.
In that case, please uninstall it and install the module you can download from the next link
If you already installed the module on top of XAMPP, please ask for help in the official XAMPP forum at https://community.apachefriends.org/f/