games wont play

I am completely new to this and have no idea what i am doing so any help would be appreciated :-[
We have just bought a Nintendo D's lite with a m3adapter + micro SD card. We have downloaded some games from your site which have then loaded and been played fine. However on some of the games all we get is a white screen. Could someone please give us some advice on how to get these games playing. ( simple instructions please ;D )
Thanks
Scooter

That is an Anti Piracy, usually happens in the newer games.
To fix it, you can try upgrading to a new firmware for your flashcart, or patch the game with the problem.

Thanks for the quick reply.Where can i find a new firmware and how do i upgrade??? (told you i was a bit thick lol)I did think it was because they were new games but tried a few old ones too with no luck so hopefully that should do the trick.