Blocking a WEBSITE on your PC without using any software for windows OS

STEP 1.

Go to Drive C:>>Windows>>System32>>Drivers>>etc.

right click the hosts file then open with notepad.

SCREENSHOT:

  

STEP 2.

at the bottom of the text file.. add this line..
FORMAT:
127.0.0.1 (SPACE) www.yourwebsite.com
EXAMPLE:
127.0.0.1 www.facebook.com

SCREENSHOT:

NOTE:

You can add multiple site by adding one per line
EXAMPLE:
127.0.0.1 www.yourwebsite.com
127.0.0.1 www.onotherwebsite.com

STEP 3.
Save the hosts file. or simply press "ctrl" + "s" in your keyboard.

NOTE:if you encounter an error saving the "Hosts" file..

Download takeownership and install it.
Download Link: Take Ownership
To install the takeownership, just unzip it then double click it.

Then Navigate again to:
Drive C:>>Windows>>System32>>Drivers>>etc.
Then right click the "Hosts" file and click "Take Ownership".

SCREENSHOT:

Then proceed to STEP 3.