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
Follow this procedure : How to change XAMPP apache server port?
It explains how resolve apache port issues in 4 steps :
If you still got a problem after try this process : this means that an application uses all available ports or dynamically change.
For exemple Skype port is dynamic, it can change the port if it is already occupied.
Simpler solution is to exit Skype, and then start Apache, then start Skype again. This is one time operation and solves the problem