Graphics card: NVIDIA GeForce GT 645M (my friwend says its bad, but i remember it handling FO4 with 30+ mods)
OS: Windows 10
anything else?
That's below minimum spec for PC VR, and the Simulator runs in a psuedo-VR mode (even though you're not using a headset), so there might be some incompatibilities with the VR systems trying to run on a video card below the minimum requirements. I'm afraid it might not run for you on your existing video card, I'm sorry.