All of a sudden my computer (imac, 10.4.11) won't let me open images downloaded from digital cameras (I've tried several - so it's not the cameras). I get the following error - "Couldn't open the file. It may be corrupt or a file format that Preview doesn't recognize." Also the same basic error when using Photoshop and Fireworks. I can open files still on the camera, or saved to a CD - just not anything dragged to the desktop. I can still open pictures which had been previously saved - but nothing new. I ran the Repair Disk utility, which found and apparently fixed an Illegal Name error on the hard drive, but the problem still persists.