Permanently block a program

Hello guys,
I know it's a stupid question for a coder like me but there were months ago I didn't code so I lost lots of programming and coding skills.
So I will say the story exactly.
My brother just opens a website [You can say a porn or any website kind you want].
And this makes him be on the PC like 10,12 hours.
And I have lots of works. So I think you understood.
I just blocked this website with the hosts file.
He just used Hotspot Shield and I made an hidden task manager made for detect HSSCP.exe and just kill it.
But killing HSSCP didn't work. HotSpot Shield had lots of processes were working and I didn't know which was I had to kill for know that they're the key for close it. But when I knew, some of them was the vpn's opener or the proxy's, however.
I just thought about making a program that makes HotSpot Shield never responds. Like makes the windows sends a message and say : "Name" is not responding. Please restart...".
But I didn't really remember the method for do that, so can you help me?
Thanks for visiting, and sorry if I was so much talkative.
