Check your computer's memory. If you're running other software at the same time, using RAM resident programs, or have many device drivers, the computer may not have enough memory. (See your software and computer manuals.) If you're scanning a large image or scanning at a high resolution, your computer may not have enough memory to process the image.
Check your software installation. Make sure that your software is correctly installed and set up. If all else fails, uninstall your software, then reinstall it.