通过注册表编辑器手动恢复 Windows Update 服务
通过注册表编辑器手动恢复 Windows Update 服务导致 Windows Update 丢失的一个原因可能是弄乱了某些注册表文件。如果是这种情况，您可以尝试通过编辑 Windows 注册表手动恢复 Windows Update 服务。IT之家网友需要注意的是，修改注册表可能会存在一定的风险，在确定操作之前请做好备份。
1. 按下 Win 键打开开始菜单
2. 在搜索框中搜索“regedit”（不需要完整输入），然后点击“注册表编辑器”
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3. 打开“计算机 \HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services”路径
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4. 这个列表会很长，找到“wuauserv”项，如果没有找到的话，直接跳过到第 9 步。
5. 右键“wuauserv”项，然后选择“导出”，保存到电脑上
https://pics2.baidu.com/feed/e4dde71190ef76c61d55594158bb88f1ae51670a.png@f_auto?token=746ab17392c60edbeadfaa1e61cef833
6. 接下来右键“wuauserv”项，然后选择“删除”
https://pics7.baidu.com/feed/0e2442a7d933c8958208f8001cbe06fb8302008b.png@f_auto?token=635dc3f4fa808402dadf09f61c011160
7. 点击“确定”
8. 关闭注册表编辑器
9. 在桌面空白区域右键，在菜单中新建一个文本文档
https://pics6.baidu.com/feed/9825bc315c6034a80c369d9e0ebe3c5f08237615.png@f_auto?token=1227a778ead1e494ac8d90b5475e2a41
10. 然后将以下代码复制到记事本中
Windows Registry Editor Version 5.00"DependOnService"=hex(7):72,00,70,00,63,00,73,00,73,00,00,00,00,00"Description"="@%systemroot%\\system32\\wuaueng.dll,-106""DisplayName"="@%systemroot%\\system32\\wuaueng.dll,-105""ErrorControl"=dword:00000001"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"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,00,65,00,74,00,73,00,76,00,63,00,73,00,20,00,2d,00,70,00,00,\00"ObjectName"="LocalSystem""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,00,65,00,67,00,65,00,00,00,53,00,65,00,44,00,65,\00,62,00,75,00,67,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,\00,00,53,00,65,00,42,00,61,00,63,00,6b,00,75,00,70,00,50,00,72,00,69,00,76,\00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,52,00,65,00,73,00,74,00,\6f,00,72,00,65,00,50,00,72,00,69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,\00,53,00,65,00,53,00,65,00,63,00,75,00,72,00,69,00,74,00,79,00,50,00,72,00,\69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,54,00,61,00,6b,\00,65,00,4f,00,77,00,6e,00,65,00,72,00,73,00,68,00,69,00,70,00,50,00,72,00,\69,00,76,00,69,00,6c,00,65,00,67,00,65,00,00,00,53,00,65,00,4c,00,6f,00,61,\00,64,00,44,00,72,00,69,00,76,00,65,00,72,00,50,00,72,00,69,00,76,00,69,00,\6c,00,65,00,67,00,65,00,00,00,53,00,65,00,4d,00,61,00,6e,00,61,00,67,00,65,\00,56,00,6f,00,6c,00,75,00,6d,00,65,00,50,00,72,00,69,00,76,00,69,00,6c,00,\65,00,67,00,65,00,00,00,00,00"ServiceSidType"=dword:00000001"Start"=dword:00000003"SvcHostSplitDisable"=dword:00000001"SvcMemHardLimitInMB"=dword:000000f6"SvcMemMidLimitInMB"=dword:000000a7"SvcMemSoftLimitInMB"=dword:00000058"Type"=dword:00000020"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"ServiceDllUnloadOnStop"=dword:00000001"ServiceMain"="WUServiceMain""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"Type"=dword:00000005"Action"=dword:00000001"Guid"=hex:e6,ca,9f,65,db,5b,a9,4d,b1,ff,ca,2a,17,8d,46,e0"Type"=dword:00000005"Action"=dword:00000001"Guid"=hex:c8,46,fb,54,89,f0,4c,46,b1,fd,59,d1,b6,2c,3b,50
11. 点击菜单栏上的“文件”，然后选择“保存”
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12. 关闭之后，右键该文本文档，然后选择重命名
https://pics1.baidu.com/feed/63d9f2d3572c11df8bb84d4fa98a17dbf603c2ae.png@f_auto?token=9e4dc7354691452de3e92ddea89feede
13. 将文件名后缀修改为“.reg”格式，名称任意，然后按下回车之后在弹窗上选择“是”
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14. 双击运行，运行完成之后重启电脑。
重置你的电脑
如果上述解决方案均无效，您可以考虑将 Windows 重置为默认设置。这会将您的计算机恢复为出厂设置并删除任何第三方软件包。IT之家网友可以按照以下步骤进行操作：
1. 使用 Win 键 + I 键组合快捷方式打开设置应用（也可以通过开始菜单等方式打开设置应用）
2. 在左侧导航面板中选择“系统”，右侧部分选择“恢复”
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3. 选择“重置此电脑”右侧的初始化电脑按钮
4. 用户可以先选择“保留我的文件”（删除应用和设置，但是保留个人文件），如果还不行的话再选择“删除所有内容”（删除所有个人文件、应用和设置）
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