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如果是Vista系统，请执行如下操作：
1. 点击开始-〉所有程序-〉附件-〉运行-〉输入services.msc-〉确定-〉点击继续。
2. 查看是否有一项名为“Windows Update”的服务，并将其启动，如果不存在此服务，请新建一个文本文件，然后将以下蓝色字体复制、粘贴到文本文件中：

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wuauserv]

"PreshutdownTimeout"=dword:036ee800

"DisplayName"="@%systemroot%\\system32\\wuaueng.dll,-105"

"ImagePath"=hex(2):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,00,73,\

  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,00,20,00,6e,00,65,00,74,00,73,00,76,00,63,00,73,00,00,00

"Description"="@%systemroot%\\system32\\wuaueng.dll,-106"

"ObjectName"="LocalSystem"

"ErrorControl"=dword:00000001

"Start"=dword:00000002

"DelayedAutoStart"=dword:00000001

"Type"=dword:00000020

"DependOnService"=hex(7):72,00,70,00,63,00,73,00,73,00,00,00,00,00

"ServiceSidType"=dword:00000001

"RequiredPrivileges"=hex(7):53,00,65,00,41,00,75,00,64,00,69,00,74,00,50,00,72,\

  00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,43,00,72,00,\

  65,00,61,00,74,00,65,00,47,00,6c,00,6f,00,62,00,61,00,6c,00,50,00,72,00,69,\

  00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,43,00,72,00,65,00,\

  61,00,74,00,65,00,50,00,61,00,67,00,65,00,46,00,69,00,6c,00,65,00,50,00,72,\

  00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,54,00,63,00,\

  62,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,\

  00,41,00,73,00,73,00,69,00,67,00,6e,00,50,00,72,00,69,00,6d,00,61,00,72,00,\

  79,00,54,00,6f,00,6b,00,65,00,6e,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,\

  00,67,00,65,00,00,00,53,00,65,00,49,00,6d,00,70,00,65,00,72,00,73,00,6f,00,\

  6e,00,61,00,74,00,65,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,\

  00,00,00,53,00,65,00,49,00,6e,00,63,00,72,00,65,00,61,00,73,00,65,00,51,00,\

  75,00,6f,00,74,00,61,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,\

  00,00,00,53,00,65,00,53,00,68,00,75,00,74,00,64,00,6f,00,77,00,6e,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,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00,00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wuauserv\Parameters]

"ServiceDll"=hex(2):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,\

  77,00,75,00,61,00,75,00,65,00,6e,00,67,00,2e,00,64,00,6c,00,6c,00,00,00

"ServiceMain"="WUServiceMain"

"ServiceDllUnloadOnStop"=dword:00000001

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wuauserv\Security]

"Security"=hex:01,00,14,80,78,00,00,00,84,00,00,00,14,00,00,00,30,00,00,00,02,\

  00,1c,00,01,00,00,00,02,80,14,00,ff,00,0f,00,01,01,00,00,00,00,00,01,00,00,\

  00,00,02,00,48,00,03,00,00,00,00,00,14,00,9d,00,02,00,01,01,00,00,00,00,00,\

  05,0b,00,00,00,00,00,18,00,ff,01,0f,00,01,02,00,00,00,00,00,05,20,00,00,00,\

  20,02,00,00,00,00,14,00,ff,01,0f,00,01,01,00,00,00,00,00,05,12,00,00,00,01,\

  01,00,00,00,00,00,05,12,00,00,00,01,01,00,00,00,00,00,05,12,00,00,00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wuauserv\Enum]

"0"="Root\\LEGACY_WUAUSERV\\0000"

"Count"=dword:00000001

"NextInstance"=dword:00000001

另存为这个文本文件为reg格式的文件，然后双击运行，提示是否导入注册表信息时，点“是”。然后重新再尝试找到，并启动Windows Update服务。

如果是XP系统，点击开始--运行--输入services.msc，回车。

确认Background Intelligent Transfer Service和Automatic Update服务是否能够正常启动。

最后更新：2017-05-12 11:31:32

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