From :
http://forum.xda-developers.com/show...volume+Warning
CREATE THIS KEY
[HKEY_CURRENT_USER\ControlPanel\Notifications\{1CBF 334F-99CC-4835-B930-E3568FE5B2C7}]
**When I post this there seems to be a space in the key name the first part should read 1CBF334F
ADD THESE SUB KEYS
"AvailableOptions"=dword:00000009
"Default"="Volume Warning"
"Options"=dword:00000000
Now go to Sounds & Notifications and you should have an option volume warning. Disable any notifications and you should no longert get the annoyiung warning.