问题描述：U盘无法使用:插入U盘,无法显示U盘MP3的盘符

插入U盘：提示“本次操作由于这台计算机的限制而被取消。请与您的系统管理员联系”。如何解决？

解决方案一：

1、右键“我的电脑”选“管理”，在“计算机管理”－“磁盘管理”中更改USB盘符符号。

2、在“运行”中输入“regedit”打开注册表编辑器，依次展开“HKEY_LOCAL_MACHINE\\SYSTEM\\CurrentControlSet\\Services\\usbehci（还有usbhub,，或者USBSTOR）”双击右面的“Start”键，把编辑窗口中的“数值数据”改为“3”，把基数选择为“十六进制”就可以了。改好后重新启动一下电脑。

注释：“Start”这个键是USB设备的工作开关，默认设置为“3”表示手动，“2”是表示自动，“4”是表示停用。

3、查看BIOS选项是否禁用USB

4、察看磁盘文件格式是否为NTFS，使用管理员账户登陆更改安全设置。

5. run command:gpedit.msc  
   
expand menu:用户配置,管理模板,windows组件，windows资源管理器,右面的"隐藏我的电脑中这些驱动器",设置为禁用，防止从“我的电脑”访问驱动器,设置为禁用

实际操作过程中，只用到了最后的方法，因WINDOWS已给出相关提示，推测是组策略中做了限制。至于regedit中的值，经查询显示正常（设置为3）。】

解决方案二：

把下面的红色代码复制到记事本中，另存为 ，选择文件类型为：所有文件，  文件名为 ：恢复USB禁用.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\usbehci]
"Type"=dword:00000001
"Start"=dword:00000003
"ErrorControl"=dword:00000001
"DisplayName"="Microsoft USB 2.0 Enhanced Host Controller Miniport Driver"
"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,00,75,00,73,00,62,00,65,00,68,00,63,\
  00,69,00,2e,00,73,00,79,00,73,00,00,00
"Group"="Base"
"Tag"=dword:0000000f

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\usbehci\Enum]
"0"="PCI\\VEN_10DE&DEV_026E&SUBSYS_CB8410DE&REV_A2\\3&2411e6fe&0&59"
"Count"=dword:00000001
"NextInstance"=dword:00000001

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\usbhub]
"Type"=dword:00000001
"Start"=dword:00000003
"ErrorControl"=dword:00000001
"DisplayName"="USB2 Enabled Hub"
"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,00,75,00,73,00,62,00,68,00,75,00,62,\
  00,2e,00,73,00,79,00,73,00,00,00
"Group"="Base"
"Tag"=dword:00000011

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\usbhub\Enum]
"0"="USB\\ROOT_HUB\\4&1b3bdeec&1"
"Count"=dword:00000002
"NextInstance"=dword:00000002
"1"="USB\\ROOT_HUB20\\4&35ce338e&1"

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\usbohci]
"Type"=dword:00000001
"Start"=dword:00000003
"ErrorControl"=dword:00000001
"DisplayName"="Microsoft USB Open Host Controller Miniport Driver"
"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,00,75,00,73,00,62,00,6f,00,68,00,63,\
  00,69,00,2e,00,73,00,79,00,73,00,00,00
"Group"="Base"
"Tag"=dword:00000010

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\usbohci\Enum]
"0"="PCI\\VEN_10DE&DEV_026D&SUBSYS_CB8410DE&REV_A2\\3&2411e6fe&0&58"
"Count"=dword:00000001
"NextInstance"=dword:00000001

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\USBSTOR]
"Start"=dword:00000003
"Type"=dword:00000001
"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