Capcom after the PlayStation and the Xbox version, today on December 19, 2016 released the DEMO version of the Resident Evil 7 on PC via the Steam.
The new “Resident Evil 7 / Biohazard 7 Teaser: Beginning Hour” available for free and includes the same DEMO game as the console version.

It should be noted that the DEMO requires minimum Core i5 CPU (similar AMD), 8GB RAM and a 2GB GPU with Direct X 11. You can download it from here: http://store.steampowered.com/app/530620/