I installed Lightroom 3. on my Sony Vaio (VGN-SZ791N; Windows 7 Ultimate). When I try to import images, the thumbnails do not appear(!). Only a blank is present. It still allows me to import, but no images show up in Library/Develop/or Print. If I select several, I can run Slideshow and the images appear correctly. Just to experiment, I used an external monitor set up as a second screen, and when I drag the Lightroom window to the external monitor, the images appear! Dragging the window back to the laptop screen the images are present until I swipe the cursor over them--they then disappear again. There is apparently no Nvidia driver available--instructions say the Windows 7 has the correct drivers. I have no problems on my desktop system!