Nintendo ds card says "file write error!" to every game...

"An Error Occurred. Press and hold POWER to turn the system off."
When do you see this error?

1. If you see this error while playing a Nintendo DS game card game:
   There are no known issues that create this error with any Nintendo DS game card games. Our experience shows that if you see this error, your game is likely a counterfeit product. To test your Nintendo DS game card, try this testing tip:
   
   
   
   • Try playing the game in a Nintendo DS Lite or a Nintendo DS (original style).
     • If the game still does not work, it's more likely the game card is defective and will need to be replaced.
     • If the game works in either a Nintendo DS or Nintendo DS Lite, our experience shows that the game is likely a counterfeit product.
   
   
2. If you see this error when there is no Nintendo DS game card inserted into your system:
   • If you have not already done so, power the system off and then back on to see if this resolves the issue. If the issue persists after the system has been powered down, please call our Consumer Department at 1-800-255-3700 to speak to one of our representatives.

First before you can use the memory card on your DS lite you have to first use the DS lite to format the memory card before putting games this ensures that the game would recognise whatever games you then put on the memory card.
Hope this solution has been helpful?

Try Lookin for a specif kernel for you DS

You can play multiplayer games with a Nintendo DS Lite even if you don’t possess a copy of the game. If one of your friends has a multiplayer game card, they can use their Nintendo DS Lite as a host for the game session and you can join the multiplayer game.
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Things You'll Need:

• Nintendo DS Lite

Using One Card to Host the Game
1. Step 1 Look on the game’s packaging for the "Multiplayer" icon. If the game requires only one player to have a copy of the game, the icon will show two DS Lites: a DS Lite with a black screen transmitting waves to a DS Lite with a white screen. Below the two DS Lites is a range of numbers which indicates how many players the game can support.
   
2. Step 2 Put the game card in the Nintendo DS Lite that is acting as the host for the multiplayer game session and start it up.
   
3. Step 3 Have the other players turn on their systems. They will use the main menu screen to access the "DS Download Play" icon. They need to tap the icon to begin downloading the game information from the host DS Lite.
   
4. Step 4 Begin playing when all of the systems have finished downloading the game information from the host.
   
Multiple Cards for Multiple Players
5. Step 1 Look at the "Multiplayer" icon. If every player in the game session needs a copy of the game in order to play, the icon will show two DS Lites, both with black screens, transmitting waves toward each other. A range of numbers is under this graphic and indicates how many people can play at one time.
   
6. Step 2 Read the game's instruction manual on how to set up the game session. The steps required vary by company and sometimes by title within the same company.
   

*reposted from ehow.com

the contacts where the game go got dirty or broken!, u will need to get it repaired

You can try wiping the data on the cartridge completely. I looked in the manual and there's no information on how to do this. It's usually something involving holding down two or three buttons while starting the game. If you can wipe all the data it should be like you have a new game. My suggestion is to call Nintendo. I'm sure they'll do their best to help you out. Don't bother mentioning to them that the game is used, they might not be pleased about that.

plug in the sd card and there should be 2 files of the game the nds and sav delete the sav file and it should work

you have to press and hold select and press right,try game again and if it still wont play, just keep doing it till you get the format that it works on. i hope this helps

Since it's brand-new I suggest bringing it back to the store for help. Someone in the video game section should be able to diagnose (in person) whether it needs to be repaired or replaced.

you need to go into the system itself and delete files from the DS itself. The DS has the capability to save files. when the game starts up, go into systems and you should be able to find where the files are and start to delete some.