My phone memory-card says that it's write-protected on the computer...?

I got the new Jonas Brothers CD a while ago (the enhanced version) and tried to put the songs on my computer (to put on my phone, i-pod... etc) but because it was enhanced, it wouldn't let me so my sister told me to rip the CD with Windows Media Player so I let her do it and i syncronized it with my memory-card and did the whole safely-removed thing...

this morning i looked through my music for it and realised that I must have put it in the wrong folder because it wasn't there, I put it in the comuter and I was right but it wouldn't let me change anything because it said that it was 'write-protected' so now my memory-card has "locked" and I don't know what to do because I was actually going top back it up tonight (i have EVERYTHING on my phone) and now I can't!!

PLEASE HELP ME!!

(it you can't be bothered reading it...basically my memory-card's locked and says that it's "write-protected" and I need to know how to unlock it because EVERYTHING'S in it!)

:S