I use XAMPP 1.7.7 after start Apache I get this alert:
Busy...
Apache started [Port 80]
And I have opened the httpd.con
Solved it for me. I updated XAMPP to PHP 5.4 and afterwards i could not start the Apache anymore. It said Start Apache (Busy). The problem was for me the Pando Media Booster (Apperently it comes with League of Legends :) ) which was blocking the port 443. So after uninstalling it, it worked again. Hope that helps.