|Is this your model:|
You just remove the 2 hand-threaded screws on the right and pull back on the side panel. It may be a snug fit so you'll probably have to pull hard or slip a flat-blade screwdriver underneath the 1/2" lip of the side panel that protruces on the rear of the case and pry it loose.
You don't need to remove the screws holding on the top or left panel as those parts don't need to be removed.
message edited by DAVEINCAPS