I hate when my PC gives me feedback with sounds, so the first thing I do after I install windows is disable all of them. Recently, I upgraded to Windows 8 and I can't find the option to disable the unlock sound.
I have all sounds disabled (including logon and logoff sounds), but this particular sound isn't in the list.
I tried deleting the file and it told me that I require permission from trusted installer. Then I rebooted into my other windows partition and tried again. I got the same message, even after taking ownership of the folder.
Finally I tried changing the location of the sound to point to an empty wav via regedit (in HKEY_CURRENT_USER\AppEvents\Schemes\Apps.Default\WindowsUnlock). Again, nothing happened.
How can I get rid of this annoyance for good?