So first you will want to download CUDAMiner, and with Mega.co.nz being down a lot lately I have a copy hosted on my Dropbox:
https://dl.dropboxusercontent.com/u/30499259/Feathercoin/cudaminer-2013-04-30.rar
And to run cudaminer.exe with the following arguements (best done in a batch file, which I’ve added to the above archive too)
cudaminer --url pooladdress:poolport --userpass username.worker:pass -s 5 -D
Sorry I can’t offer much more advice than this, I’ve not actually got the ability to play around with a Nivida GPU, bar one. And if required, I’ll try out that GPU for you tomorrow too.
Edit: It may be of some advantage and help to look here to see what sort of rates and configs people are using for your GPUs https://github.com/litecoin-project/litecoin/wiki/Mining-hardware-comparison#wiki-Nvidia_GPUs