I have the version of guiminer that allows for litecoin mining but I can't find the correct settings for my graphics card.

I know most graphics cards are using cudaminer but I am having difficulty setting either of them up for mining.

I got it to start working but when I was trying out bitcoin mining I was mining around 69 Mhash/s. Right now I'm mining at 210 Khash/s. Why such a large difference?