Hi, John.
This is a common problem that dates back to Win2K. :>( We've discussed it here many times.
An Export from my Registry is attached to this message. I'm running Quicken
2007 Basic in Vista Ultimate x64, but I think this .reg file will work for any version of Q2007 and with any version of Vista. I've saved it as a .txt file because you (or anyone else) will need to Edit it before you change the suffix to .reg and Import (merge) it into your own Registry. You will need to change my Quicken folder name (E:\QuickenW - and note that the .reg file requires the "\\" to be doubled) to your own folder name before merging it.
Once this Registry import is done, you should be able to change any sounds you don't like from Control Panel | Sound | Sounds. But, until then, you probably won't see Quicken listed at all on that screen. And checking the box within Quicken will have no effect.
If you are not comfortable with changing the Registry, please ask a geeky friend to help you with it. Registry changes cannot easily be undone and can leave your computer non-functional. At least, Export your existing Registry key before Importing the revised version; then, if something goes wrong, you can re-Import your original version.
RC