Hi Darkness, don't worry, you have some options...
I use this 2 programs together and trust me, you will no be able to watch porn again on your computer...
Cold Turkey
https://getdpd.com/cart/hoplink/20477?referrer=1cawn1rk5ksgsw4w with this software you will be able to block the access to a lot of things, windows apps, websites and a lot, they have a free and paid version.
With the pro version you will be able to block the entire internet access for defined hours (like nights), for dates (when you usually stay alone in home) and a lot of options.
Home Guard
http://veridium.net They have a free 14 days trial that will let you know if it works for you or not. With this software you will be able to block adult searches, access to web categories, to keywords, dates, hours, programs, and a lot of choices...
Trust me friend, you will no be able to watch porn again.