Website? I suggest you use steam instead, because then you can download the game whenever - on new computers too.
Also, buy Dark souls II - Scholar of the first sin, not regular Dark souls 2. The price is the exact same, but Scholar is a reworked version with all the dlcs.
Here are the minimum steam version requirements:
MINIMUM:
OS: Windows 7 SP1 64bit, Windows 8.1 64bit
Processor: AMD® A8 3870 3,6 Ghz or Intel® Core ™ i3 2100 3.1Ghz
Memory: 4 GB RAM
Graphics: NVIDIA® GeForce GTX 465 / ATI Radeon TM HD 6870
DirectX: Version 11
Network: Broadband Internet connection
Lagring: 23 GB available space
Soundcard: DirectX 11 sound device
https://store.steampowered.com/app/335300/DARK_SOULS_II_Scholar_of_the_First_Sin/
According to these requirements, you should be able to run this version of the game without trouble.