Renderer #0 could not be initialized

[nofoullanguage]

Hi I am having the same problem here (mostly) I dl'd the demo from Steam, because I have to wait for my paycheck to actually buy the whole thing, but when I try to launch the demo, my screen goes black, the resolution changes to something like 600x800, flashes black and then the FATAL ERROR window comes up with the Renderer #0 issue.
I have installed all the available updates for my graphics card driver, and I'm really not terribly fluent in everything computer-related, but I would really like to resolve this issue before I purchase a game, so that I know it at least works.

Thanks in advance for any help anyone could give
Cheers

Jessica