FIX Can not anable real-time protecton ( Bật tường lửa trên win 8 - 10)

This registry fix may get Defender working . . .

Click your Start Button, type regedit and hit Enter to open the Registry Editor

In the left pane, navigate to:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SecurityHealthService

In the right hand pane, double click Start

Set its value to 2

In the left pane, navigate to:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender

In the right hand pane, if DisableAntiSpyware and DisableAntiVirus exist, double click both DisableAntiSpyware and DisableAntiVirus

Set their values to 0

If DisableAntiSpyware and DisableAntiVirus do not exist, right click an empty space on the right hand pane and choose New - DWORD (32-bit) Value and name them appropriately

Set their values to 0

Clikc OK and close the Registry Editor

Restart your PC