Okay, is there a write protect switch on the card? From what I've read (I've never used one), if the write protect switch is on, you won't be able to write to the card.
This is really out of my scope, maybe someone else on the forum uses an SD card & can tell you more...I'll ask.

Did you read the manual that came with it? If you didn't get one, get the details from the box it came in & visit their website as their support site will most likely have FAQ's & possibly a downloadable manual.

try using music match, or other music program, windows media player does not work for some mp3's

thank you everyone

i thought of it when birdy said a write protect switch and theres a lock switch on the card so im gonna guess thats it

Try switching the write protect to 'off' & see how it goes then.