A:AnswerDefault RAM memory in the laptop is clocked at 2666 MHz so it should work.
I installed a 2400 8gb ram from my previous laptop and it just underclocked the other one and it worked totally fine
A:AnswerIm guessing your limitation is the 4GB of video ram. With VR, you need at least 6GB to run properly. If someone told you at the store that this would run VR, I would return it for that reason and look for an option with a 6GB gpu. You may want to look into a desktop.
A:AnswerYes, language support is within Windows. You should be able to change your keyboard layout during the initial setup, if its already setup, you can just go into the pc keyboard settings and change it to what you need.