Fun: Change the default windows XP start up and logoff sounds with your custom music.

Change the startup, shutdown, and any system sounds on your Windows computer.
Steps
Go to the Control Panel.
1. Click the Sounds and Audio Devices icon.
2. Click on the sounds tab.
3. Click on the sound you wish to change, the sounds are available and labeled in the box on the lower half of the Sounds control box. (Choose windows logon or windows logoff)
4. Click the Browse button in the bottom right corner of the box.
5. Select your custom sound.
6. Press the play button next to the Browse button to confirm your sound.
7. Save the Sound Scheme by clicking Save As and setting a unique name.
8. Make sure your sound scheme is selected.
9. Click Apply and exit out the box.
Tips
• While any sound can be used, it is typically best to use WAV sound files.
Warnings
• Cannot change startup sound in Windows Vista using the method given. The startup sound is played immediately after Windows has loaded, due to a system file that is not editable without additional programs to edit the system files controlling the startup.