hi tech help needed , sorry if in the wrong place!!

i have no trouble downloading and transferrign games ( in nds file) but when i open them on my ds i get a message saying " cannot read data reload?" plssssss help.. have looked at loads of tutorials and i must be blonde as i cant figure out what i am doing wrong many thanks
tracey xxx

Read this, it may help.http://forum.romulation.net/index.php?topic=1462.0After reading the topic, answer the following...-What flash cart?-Got firmware?-Did you extract the games from the .rar file using winrar?

the steps i followed were as directed1/ download the games to pc using winrar ( do i open or save?) 2/ extract the games from winrar ( nds format) and place them in the games folder i created on the chip 3/ annd when i open the game on the ds it says data cannot be read pllllllllseeeeeeee help its driving me crazy .... ( she says hoping!!)tracey xxx

what card are you using and you need the firmware for that card by the sound of it...