just sorted this out for my son,
1st by the card reader r4 for ds and ds lite or r4i for the dsi,www.r4i.co.uk is the website.
2nd download the software onto your pc and then transfer onto the memory card which slots into a usb port thingy.then stick that on your desktop.
3rd if you haven't put the games into a folder on your pc you'll need to do that and then just copy and paste into the your folder and the games will go in.
Takes about 30 seconds to put the games onto the card once you've run the software.
Email me if you get suck as I'm no good with these sort of things but even I managed it with HELP from my aunte