Moved to Tips & Tricks
Uncheck the box in your p2p client, so you can use the player of your choice.
Open Windows Explorer and navigate to one of your songs.
Right-click the file
Choose 'Open with'
A window will open to show all the applications installed on your PC.
Find the player you want to use and select it. Tick the box where it asks if you want to use this application to always open files of this type.