If you can take the hard drive out of your computer and set it as a slave drive and install it in your brothers computer you should be able to find your music files and put them on his system, if he has a burner you can burn them to a Cd or DVD if he has that.
Agreed.
But since that’s not the case, are you able to get into safe mode, if yes try last Known configuration and see if that works, or if you have a spyware program on you system like Adaware or Spybot S&D run them both in safe mode.