你好，按正常思路来想，这个现象应该是Plug and Play服务被禁用掉，只要Plug and Play服务启动即可，但可能该服务也找不见。
请在开始菜单里运行regedit查找对应的注册表，按正常来说，HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PlugPlay该值应该存在，如果不见问题就出在这
解决办法：到另一台电脑查找该项，将该项导出，然后再导入到你的电脑上。
  
如果嫌麻烦，我把该注册表文件贴上来，免得当你只有一台电脑没地方copy。
把以下文字复制到记事本，然后保存，起名为“设备管理器空白修复。reg”
Windows Registry Editor Version 5。00
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PlugPlay]
"Description"="使计算机在极少或没有用户输入的情况下能识别并适应硬件的更改。
  终止或禁用此服务会造成系统不稳定。"
"DisplayName"="Plug and Play"
"ErrorControl"=dword:00000001
"Group"="PlugPlay"
"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,00,73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,73,\
  00,65,00,72,00,76,00,69,00,63,00,65,00,73,00,2e,00,65,00,78,00,65,00,00,00
"ObjectName"="LocalSystem"
"PlugPlayServiceType"=dword:00000003
"Start"=dword:00000002
"Type"=dword:00000020
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PlugPlay\Security]
"Security"=hex:01,00,14,80,90,00,00,00,9c,00,00,00,14,00,00,00,30,00,00,00,02,\
  00,1c,00,01,00,00,00,02,80,14,00,ff,01,0f,00,01,01,00,00,00,00,00,01,00,00,\
  00,00,02,00,60,00,04,00,00,00,00,00,14,00,8d,01,02,00,01,01,00,00,00,00,00,\
  05,0b,00,00,00,00,00,18,00,9d,01,02,00,01,02,00,00,00,00,00,05,20,00,00,00,\
  23,02,00,00,00,00,18,00,ff,01,0f,00,01,02,00,00,00,00,00,05,20,00,00,00,20,\
  02,00,00,00,00,14,00,fd,01,02,00,01,01,00,00,00,00,00,05,12,00,00,00,01,01,\
  00,00,00,00,00,05,12,00,00,00,01,01,00,00,00,00,00,05,12,00,00,00
将以上存为。
  reg的文件即可。
不想自己动手也可，我也准备了现成的文件。见附件。
点击这个文件，即可修复。
。