设备管理器没有声音选项

感觉可能是系统缺少某些文件导致

你这是把注册表给删了

Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\{4D36E96C-E325-11CE-BFC1-08002BE10318}]
"Class"="MEDIA"
"ClassDesc"="@mmci.dll,-3000"
@="Sound, video and game controllers"
"IconPath"=hex(7):25,00,73,00,79,00,73,00,74,00,65,00,6d,00,72,00,6f,00,6f,00,\
74,00,25,00,5c,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,6d,\
00,6d,00,73,00,79,00,73,00,2e,00,63,00,70,00,6c,00,2c,00,2d,00,33,00,30,00,\
30,00,34,00,00,00,00,00
"LowerLogoVersion"="5.1"
"Installer32"="mmci.dll,MediaClassInstaller"