进入IE选项，安全标签，发现自定义级别是灰色的。
- Click Start, Run and type REGEDIT.
- Navigate to :
HKEY_CURRENT_USER \ Software \ Policies \ Microsoft \ Internet Explorer \ Control Panel
and
HKEY_LOCAL_MACHINE \ Software\ Policies \ Microsoft \ Internet Explorer \ Control Panel
- Backup the keys by exporting it to REG file.
- In the right-pane, select the SecChangeSettings value and delete it.
- Then, navigate to the following location:
HKEY_LOCAL_MACHINE \ SOFTWARE \ Policies \ Microsoft \ Windows \ CurrentVersion \ Internet Settings
- In the right-pane, select the Security_options_edit value and delete it, or change its value to 0.
- Close Registry Editor.
