Use Aida64 or Speccy to identify the GPU. Then download latest drivers from nVidia. Open the file with WinRAR or similar utility and extract the files to a folder. Open Control Panel, Device Manager, Display adapters, right-click on the card, select Update driver, select second option, again select second option. Now click on have disk and browse into the folder until you find the display driver. Open the .INF file and you should see a list of graphics adapters. Locate the first entry of your card (such as GT 630) and proceed. Windows will warn you that the driver might not match, proceed anyway. Restart the computer and then open Device Manager again to check if the Display adapter is OK.