Find out the model of your graphic card in device manage and search for it in nvidia's support site. Download, install and restart. Try this and if not work describe the problem an I will see what I can do.
Ok, the "video controller (vga compatible)" with questiojn mark means that you do not have a driver installed. Can you right click and update driver? If that doesn't work, right click>properties and find out what device it is and download a driver.