When I open iTunes it reminds me it's not the default and asks if I would like to go to something and change it, I click yes and de-select all Media Player options and select all iTunes, so that should make my iTunes the default player. ITunes was always my default player but one day I put a DVD in my laptop and they play on Windows Media Player, a wee box come up about default players but I never read it and just clicked yes, by do ing that I set Media Player as my default audio player.