I upgraded from Vista HP 32 bit to Windows 7 HP 32 bit. Have also installed iTunes which I want to be default for most audio files. Opening Media Player for the first time, in the set up options when I go for custom settings to choose which files are played by default. It won't let me untick any file times, they're greyed out. I've abandoned setup for now but just wondered if anyone else had experienced this? Any ideas?