If you wish to set the No Sounds sound scheme into the default profile, so that all new users are silent, you can use REG.EXE, built into Windows XP, Windows Server 2003, and later operating systems, or installed from the Windows 2000 Support Tools, and include the following command in a startup script, or other batch file:

REG ADD HKU\.DEFAULT\AppEvents\Schemes /VE /T REG_SZ /F /D ".NONE"

NOTE: To change current users, you can include the following in a logon script:

REG ADD HKCU\AppEvents\Schemes /VE /T REG_SZ /F /D ".NONE"