disable windows Vista speech dictation (windows form -VB.NET 2008)

Thanks God :)

finally , i found a solution , may be someone will need it one day :)
speech recognition can work in two modes , either command-and-control or dictation mode , both can be disabled in any application through registry editor ,

to disable dictation for some application from regedit:
insert string value in (HKEY_CURRENT_USER\Software\Microsoft\Speech\Preferences\AppCompatDisableDictation)
set it's name to the application.exe file , i.e to disable dictation for microsoft word , add new string with name word.exe

while to disable command :

use this key, to add the executable application you wish to disable speech command within it(HKEY_CURRENT_USER\Software\Microsoft\Speech\Preferences\AppCompatDisableMSAA)

hope this may be useful to some one :)