Hello , sorry about your problems. My name is Marco and I am independent advisor. So, I will do my best to help you.
Try this way.
-Press Windows + e keys to open Windows explorer
-Right-click on the cd/dvd player
-Right-click on your player. From the context menu, select Properties.
-Open "hardware" tab.
-Select the name of the player and at the bottom, do "properties".
-Click the "DVD Region" tab.
-Look in the list offered to you and select a country in the region from which the DVD originates.
-Below the list of countries you can see the number of the current region of your player and just below, when you have chosen a country, the number of the new region.
-Press the OK button to save the region change of your DVD player.