Is this your computer? http://pcper.com/reviews/Mobile/ASUS-N55-Core-i7-156-Notebook-Review-Can-One-Laptop-Do-It-All
hanging audio can be due to bad ram, a bad driver, corrupt files, or a dead/dying sound card. If it hangs on the same song in the same spot then I sould suspect that it is a bad file. If it is random then it could be any of the other issues. I would update the sound card's driver first (completely uninstall the old driver, then load the new driver). If that does not work then I would look into RMA for the laptop if possible, or a new sound card.