All credit goes to: https://gtm.steamproxy.vip/profiles/76561198152857803 <------- This gentlemen here



1) Right-click on your desktop, then open NVIDIA Control Panel
2) Head to "Manage 3D Settings" > Program Settings > Select Dark Souls (darksouls.exe), or add it if it isn't there.
3) Select the preferred graphics processor for the program: "Integrated Graphics"

Then the game launches properly.

4) In the menu PC Settings, change it to Fullscreen and select your resolution
5) Quit the game

Open NVIDIA Control Panel again and this time select High-performance NVIDIA Processor and you're done.

That's it. Hope this helped you guys as it had helped me. Pls rate if this works. Have a great day and don't forget to praise the sun ^_^