I spend too much time on the computer, and don't have very good self-control. Is there any way to lock myself out from Windows, for a custom set period of time? I have important things to do in my life, and I'm not accomplishing anything. It's depressing as all hell :(

I tried the StayFocusd Chrome extension to block me from websites, but i can still get around the block by disabling the extension. I need something more effective that can't be tampered with until the time expires.