How do I use the rMC to launch 64-bit images in Amazon EC2?
First, be sure you have added a 64-bit Amazon EC2 image definition to your appliance; to learn how, see the help links for Image definitions in your appliance workspace. With the new image in place, rebuild your appliance contents, and then generate a new set of images (or just the one 64-bit EC2 image you need). Launch the new 64-bit EC2 image with its green launch button. In the launch dialog in the rMC, expand the options and select Large from the Instance Type drop-down list. This will automatically run your instance as a 64-bit system.