Sounds like it might have been a corrupted install. But I feel the need to comment on the large image size. What would you need a 8000 pixel image for, unless a poster or banner that someone might look at so close that their nose will press against it. Except for test renders I save in TIFF format and turn it into a JPEG at the last step after editing. Almost all images, whether from a digital camera or 3D software benefit from some brightness and contrast adjusting. People have made usable 20x30 inch prints from 2000x3000 pixel digital camera images. Unless you are making a life sized poster that will be viewed close up, I dont see the reason for a 8000 pixel image.

Henry