SOLVED. I spent 2-3 hours for 2 days trying up get my NVIDIA NVS 300 Graphic card to show up in devise manager in Windows 7 64. Neither could I successfully download the NVIDIA driver from the manufacturer OR successfully apply any MS fixes related to "Graphic Card not Showing" fix.
ANSWER: Install Windows 10. The installed NVIDIA NVS 300 GRAPHIC CARD AUTOMATICALLY POPULATED, and showed up in device manager, where I was able to right click on the listed graphic card and update driver for the lasted version!
PROBLEM: Windows 7 inability to fix/find drivers for select graphic card models.
I'm already use Windows 10 and always kept it updated. But still my graphic card not showing up in device manager. What should I do? Did you do the full cleaning on your pc? Or did you format your pc?