read your motherboard manual it will tell you which slots your ram should populate for running them in dual channel (if your board support it that is), but from your screens it doesnt look like its running in dual channel how it is
it might be your fsb strap. boot to bios and see what options you have under DRAM Frequency. if there is one that says 800MHz change it to that. post a screen a the cpu tab in cpu-z see whats happening.
as for dual channel, have you tried sticking the stick in another slot? they usually are the same colour for dual channel