"Save data could not be accessed..." Tried everything! Please help|!

Hi,

I have an R4 for my ds and the games do not work. It reads:

"save data could not be accessed. please turn the power off and reinsert the ds card"

I have read many forums and tryed to solve this by downloading the latest firmware (kernel 1.18) and also extracted the files from each game and added the arm7 patch.

Both of these have not solved the problem.

Can someone please please enlighten me as to what im doing wrong??

Thank you
Hannah