Event Sounds

Hi! I have an annoying problem maybe one of you smart people can help me solve. I am getting obnoxious "event sounds" when using MS Word (Office 2000), Excel (Office 2000) and Outlook (2003). I am using Windows XP Home Edition. For example, every time I open one of these applications they always make a "popping" sound while opening. Then, for example, when I am copying/cutting a range of cells in Excel it makes another whole set of noises. I have enough voices going on in my head without having to hear these!

Here is what I have done so far:
1) Applications: I have gone to Tools-Options-Other-Advanced Options and made sure the "Provide Feedback with Sound" is UNCHECKED. (Tools-General in Word and Excel)
2) Windows: I have gone to Start-Control Panel-Sounds, Speech and Audio Devices-Sounds. Here is a listing of all of the event sounds. I have reviewed all of the sounds by clicking the option to hear the sound, but none of them are the same sounds mentioned earlier.
3) I went to "Add/Remove Programs" and made sure that "Microsoft Office Sounds" was not installed. It is not on my system.

I recently upgraded to the Outlook 2003, from Outlook 2000. I can't swear to it but I think that is when my problem started with these stupid sounds.

Any thoughts on how to turn these sounds off for good?
Thanks!