Damian is trying to get an app called AllCast to work on his PC with AllCast Receiver, but it won't work for him. It works on his brother's PC, though. Leo says that AllCast is a great program that allows you to cast to it through Chromecast and it was designed to work with any streaming player. You can even turn your PC into a Chromecast like device. It's kind of a hack, though, so it may not work consistently.
There could be an issue with his firewall. Leo says that AllCast works with Port 5315 and he may need to open that port to use it.