莫名其妙的被安装了Avast Free Antivirus，然后，系统的远程桌面无法连接，打开系统远程设置灰掉了。查看服务，也没有了remote desktop services服务，其他相关服务还在。

解决办法是找其他相同版本系统导出注册表Termservice，导入到有问题的电脑中。

一、在正常电脑中

1、按Win+R输入regedit打开注册表

2、找到Termservice项，右键退出

路径为计算机\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TermService

二、在有问题的电脑

1、将有导出来的注册表信息复制到有问题的电脑中，双击直接导入

2、重启电脑，在服务中就可以看到remote desktop services服务

三、附 Win10企业版LTSC 1809版本 TermService注册表信息

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TermService]
"DependOnService"=hex(7):52,00,50,00,43,00,53,00,53,00,00,00,00,00
"Description"="@%SystemRoot%\\System32\\termsrv.dll,-267"
"DisplayName"="@%SystemRoot%\\System32\\termsrv.dll,-268"
"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,00,00,01,00,00,00,60,ea,00,00,00,00,00,00,60,ea,00,00
"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,00,20,00,4e,00,65,00,74,00,77,00,6f,00,72,00,6b,00,53,00,65,00,72,00,76,\
  00,69,00,63,00,65,00,00,00
"ObjectName"="NT Authority\\NetworkService"
"RequiredPrivileges"=hex(7):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,00,65,00,67,00,65,00,00,00,53,00,65,00,41,00,75,\
  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,\
  00,00,53,00,65,00,43,00,68,00,61,00,6e,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,\
  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,\
  65,00,49,00,6d,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,00,65,00,67,00,65,00,00,00,00,00
"ServiceSidType"=dword:00000001
"Start"=dword:00000003
"Type"=dword:00000020

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TermService\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,\
  74,00,65,00,72,00,6d,00,73,00,72,00,76,00,2e,00,64,00,6c,00,6c,00,00,00
"ServiceDllUnloadOnStop"=dword:00000001

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TermService\Performance]
"Close"="CloseTSObject"
"Collect"="CollectTSObjectData"
"Collect Timeout"=dword:000003e8
"Library"="C:\\Windows\\System32\\perfts.dll"
"Open"="OpenTSObject"
"Open Timeout"=dword:000003e8
"InstallType"=dword:00000001
"PerfIniFile"="tslabels.ini"
"First Counter"=dword:000021fe
"Last Counter"=dword:000021fe
"First Help"=dword:000021ff
"Last Help"=dword:000021ff
"Object List"="8702"