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
http://www.devside.net/wamp-server/opening-up-port-80-for-apache-to-use-on-windows
Windows 8 Skype can't be changed from using port 80; so it's a few choices ... Race for what get's it first .... Uninstall what uses port 80 .... Best answer : Free-up your server and its resources, Install only min needed software or apps, use a second computer to edit your server, and do your other things like Skype if you want real performance
These issues or run a rounds, should only be happening on Virtual Machine setups, which of coarse can still be avoided except for the performance loss well never be regained 100% and often the image is only licensed for 3 month periods anyways.
Windows 10 well have multi desktops .... it well probably be best to allow some users to install their own apps like Skype and not have their choices/installs effect other users or vice versa depending on who all makes the choices or is primary user(s). On a multi user system, the headache might be someone not around enough, who might just not be able to keep accepting new requests being that so many programs want the port.