Hi Serob,
this is not an usual error. I was able to find only one post regarding this error: "Your Computer Does Not Have a Nvidia Graphics Card"
Can you try the promoted solution?
Which RealityCapture version are you using? Were you running RealityCapture on that machine before? What do you mean by that RealityCapture identifies it and then not? Do you see the GPU under MESH MODEL/Create Model/Settings/Advanced/GPUs to use?
