usb不能识别问题

    今天遇到一个问题就是全部usb设备都不能识别，用键盘操做麻烦就用了mstsc远程链接到有问题的机器上操做。

1.起初开始菜单运行中devmgmt.msc看到设备管理器都是好的，从新扫描设备仍是不行，后来更新usb驱动重启仍是不行，bios中检查usb设备enable的，默认bios重启仍是不行，f8安全模式仍是不行。检查usb口插到后面usb仍是不行，换好的鼠标仍是不行。
2.这下能够判断能够能是usbstor注册表有问题。
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentCntrolSet\Services\USBSTOR] 的问题从本身的xp系统导出usbstor键值

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR]
"Type"=dword:00000001
"Start"=dword:00000003
"ErrorControl"=dword:00000001
"ImagePath"=hex(2):73,00,79,00,73,00,74,00,65,00,6d,00,33,00,32,00,5c,00,44,00,\
  52,00,49,00,56,00,45,00,52,00,53,00,5c,00,55,00,53,00,42,00,53,00,54,00,4f,\
  00,52,00,2e,00,53,00,59,00,53,00,00,00
"DisplayName"="USB 大容量存储设备"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR\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,fd,01,02,00,01,01,00,00,00,00,00,\
  05,12,00,00,00,00,00,18,00,ff,01,0f,00,01,02,00,00,00,00,00,05,20,00,00,00,\
  20,02,00,00,00,00,14,00,8d,01,02,00,01,01,00,00,00,00,00,05,0b,00,00,00,00,\
  00,18,00,fd,01,02,00,01,02,00,00,00,00,00,05,20,00,00,00,23,02,00,00,01,01,\
  00,00,00,00,00,05,12,00,00,00,01,01,00,00,00,00,00,05,12,00,00,00
 

3.刚开始删除不了有问题的xp机器的usbstor键值，后来去安全模式删除不了，后来用软件删除不了，后来设备管理器停用usb设备仍是不行，后来检查了usbstor的权限打上everyone彻底控制就能够把整个usbstor删除掉，而后倒入好的xp的usbstore.reg就能够了，而后从新启动。usb有能够用了。