安装sqlserver出现wmi无法启动

@echo on 
cd /d c:\temp 
if not exist %windir%\system32\wbem goto TryInstall 
cd /d %windir%\system32\wbem 
net stop winmgmt 
winmgmt /kill 
if exist Rep_bak rd Rep_bak /s /q 
rename Repository Rep_bak 
for %%i in (*.dll) do RegSvr32 -s %%i 
for %%i in (*.exe) do call :FixSrv %%i 
for %%i in (*.mof,*.mfl) do Mofcomp %%i 
net start winmgmt 
goto End 
:FixSrv 
if /I (%1) == (wbemcntl.exe) goto SkipSrv 
if /I (%1) == (wbemtest.exe) goto SkipSrv 
if /I (%1) == (mofcomp.exe) goto SkipSrv 
%1 /RegServer 
:SkipSrv 
goto End 
:TryInstall 
if not exist wmicore.exe goto End 
wmicore /s 
net start winmgmt 
:End

1) Start the computer and press F8 on boot up and select Safe Mode.
2) In the start menu type "cmd" (without quotes) and on the top search result, right click the program icon and choose Run as administrator
3) Type "net stop winmgmt" (without quotes) and press Enter to make certain the WindowsManagementInstrumentation (WMI) service is not running.
4) Open a Windows Explorer and locate the path to C:\ windows\system32\WBEM\ folder and rename the Repository folder to something else like RepositoryOLD (right click and choose 'Rename Folder').
5) Reboot and restart as normal.
6) In the start menu type "cmd" (without quotes) and on the top search result, right click the icon and choose Run as administrator
7) Type "net stop winmgmt" (without quotes) and press enter to stop the WMI service.
8) Type "winmgmt /resetRepository" (without quotes) and restart the computer.

Win32_Service.Name='winmgmt'

PS C:\Windows\System32\wbem> get-wmiobject -Query "SELECT NAME FROM WIN32_SERVICE WHERE NAME = 'winmgmt'"
Get-WmiObject : 未将对象引用设置到对象的实例。
所在位置 行:1 字符: 14
+ get-wmiobject <<<< -Query "SELECT NAME FROM WIN32_SERVICE WHERE NAME = 'winmgmt'"
 + CategoryInfo : NotSpecified: (:) [Get-WmiObject], NullReferenceException
 + FullyQualifiedErrorId : System.NullReferenceException,Microsoft.PowerShell.Commands.GetWmiObjectCommand

using System;
using System.Management;
public class Sample 
{ 
 public static void Main() 
 {
 ManagementClass c = new ManagementClass("Win32_Process");
 foreach (ManagementObject o in c.GetInstances())
 Console.WriteLine(
 "Next instance of Win32_Process : {0}", o["Name"]);
 Console.ReadKey();
 }
}