Saved pictures on computer, forgot to delete from sd card?

And now I took like 50 more pictures on the camera. How can i save these pics without re-saving the ones I already have save? The program I'm using is ViewNX 2, Nikon's software.

Http://keerok-photography.blogspot.com/2011/09/detailed-instructions-on-how-to.html

NoShoes -

All you have to do is when you insert your memory card in your computer and the list of all the images comes up (including the ones you'd previously shot & transferred) only select (highlight), copy, and paste the new ones in whatever folder you want to put them in (or the program you want to import them into).

Good luck. Hope that helps. So glad to hear you offload your pics regularly. Once you verify the transfer has worked, usually a good idea to format the memory card before your next use.