Like Vista, Win 7 doesn't offer a way to change the stupid startup sound to something more appropriate.
A Google search led me to this trick posted on this WinVistaClub forum.
Link Removed
The method described seems to work for Win 7 as well.
To avoid permission issues with replacing a system...
backupcreation
boot process
customization
dll replacement
forum discussion
homer simpson
linux boot
multiboot
permissions
reshacker
sound modification
startup sound
system files
ubuntu
user experience
windows 7
windows vista