.wav sounds not working in new sound scheme in Windows 7

I recently had to reinstall Windows 7 on my computer due to system restore problems and now system restore works again, but a new problem has been created.

I have always went into my sound option in the control panel to create my own personal sound scheme using various wave sounds I have saved on an external drive and they have always worked great, now however, not all of them will play in the scheme or when I click the "Test" button, I hear nothing. Some work, some don't, even though they are all .wav files. I use the "browse" button in control panel/sound to get to those files.

Because I reinstalled Windows 7, and the registry is reset to its default, is there a setting in the registry I need to adjust to "Play all sounds" or something? All sounds play well in WMP but certain ones won't work in the scheme, or the test button. Please advise. They did all work before I reinstalled windows so I am wondering if it is a registry setting or something else I am overlooking.
I have searched the internet, and can find nothing. Please help me!

I am not sure what it was, but it did have something to do with my Sound Blaster Audigy FX sound card. I went in after reinstalling it and adjusted the settings and now the .wav sounds work. Thank you for your reply.

I am just one of those people that wants to know what I did so I know what to look for next time.

I did get all of the wav sounds working in my sound scheme, however there is just one, the "Maximize" sound (program event) that will not work in the scheme. It works when you click on the "Test" button but not when you maximize a minimized window.

I have tried other sounds including ones that work, but it seems like there is something wrong with the one program event. Anywhere else I can look? It does not make sense.