I recenlty had to change to another machine. Both have Windows 7. I custumized the startup and exit sounds, which last about 6 or 7 seconds. However, on the new machine, the same sounds (and sound files) get cut off at 1 or 2 seconds on both startup and shutdown. I didn't know that was changeable. Why will the new machine not play the whole 6 seconds but the old one did? How do I change it?