How to Block USB port manually

Run - Type " regedit "

Click - KEY_LOCAL_MACHINE ->

SYSTEM ->

CurrentControlSet ->

services->

ushub -->  CLICK - Start (You can see it on R.H.S)

It looks something like this.

Now, Change value data to 4 like this

Click - Ok and you are done. Reboot your computer now your computer USB port are blocked.