windows7没有声音的问题其中之一是：音频服务尚未运行Windows Audio服务，最终是AudioEndpointBuilder 数值未设置。

设置相关步骤如下：

1、查看AudioEndpointBuilder的是否有；开始 -> 运行 -> regedit
在HKEY_LOCAL_MACHINE\SYSTEM\Currentcontrolset\Serivers\AudioEndpointBuilder

2、将下面内容保存为”XXX.reg”文件：

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\AudioEndpointBuilder]
“DisplayName”=”@%SystemRoot%\\system32\\audiosrv.dll,-204”
“Group”=”AudioGroup”
“ImagePath”=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,00,\
74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,\
00,76,00,63,00,68,00,6f,00,73,00,74,00,2e,00,65,00,78,00,65,00,20,00,2d,00,\
6b,00,20,00,4c,00,6f,00,63,00,61,00,6c,00,53,00,79,00,73,00,74,00,65,00,6d,\
00,4e,00,65,00,74,00,77,00,6f,00,72,00,6b,00,52,00,65,00,73,00,74,00,72,00,\
69,00,63,00,74,00,65,00,64,00,00,00
“Description”=”@%SystemRoot%\\System32\\audiosrv.dll,-205”
“ObjectName”=”LocalSystem”
“ErrorControl”=dword:00000001
“Start”=dword:00000002
“Type”=dword:00000020
“DependOnService”=hex(7):50,00,6c,00,75,00,67,00,50,00,6c,00,61,00,79,00,00,00,\
00,00
“ServiceSidType”=dword:00000001
“RequiredPrivileges”=hex(7):53,00,65,00,43,00,68,00,61,00,6e,00,67,00,65,00,4e,\
00,6f,00,74,00,69,00,66,00,79,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,\
67,00,65,00,00,00,00,00
“FailureActions”=hex:80,51,01,00,00,00,00,00,00,00,00,00,03,00,00,00,14,00,00,\
00,01,00,00,00,60,ea,00,00,01,00,00,00,c0,d4,01,00,00,00,00,00,00,00,00,00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\AudioEndpointBuilder\Parameters]
“ServiceDll”=hex(2):25,00,53,00,79,00,73,00,74,00,65,00,6d,00,52,00,6f,00,6f,\
00,74,00,25,00,5c,00,53,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,\
41,00,75,00,64,00,69,00,6f,00,73,00,72,00,76,00,2e,00,64,00,6c,00,6c,00,00,\
00
“ServiceDllUnloadOnStop”=dword:00000001

3、然后运行”XXX.reg”文件；

4、最后重启电脑。

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