Scrypt is rough to run on GPUs. Make sure you have the most up to date drivers too. What errors do you get?
Also, what kernel did you specify? phatk works best on nvidias I've found, although that's still pretty dismal.
Just to check, you're not trying to do both at once are you? I mean, you can't do BTC AND LTC at the same time on the same GPU. Might as well mine BTC on the GPU and LTC on the CPU really.
Sorry, I forgot to come back and update this thread, it is solved. It turns out I'm an idiot and I just needed to wait about 5 minutes and then it starts right up, lol...
I appreciate your trying to help though!