Memory Card Error - Card Locked

Ive got a sd card that suddenly as i put it in to the camera it said MEMORY CAD ERROR and at the bottom CARD LOCKED!!I tried putting it in my computer cardreader but also didnt work!what can i do?
thanx already now!

There should be a little tab on it that you can flick to unlock it. That should get things going for you.

same issue with me. card reader doesnt recognize my card. camera claims it is locked. the lock tab is in the "UNlock" position. i tried the tape thing, i tried dismantling the card gently and cleaning the leads, re-assembled, and nothing has worked. i emailed sandisk to ask why this is happening and no response yet. i have two weeks of irreplaceable memories on this card. please assist me in not crying. thank you.

I had two memory cards 16gb that were the little cards you need to put in the big case. Not sure how to explain this. It't like a phone card the way you use it. Anyway, both gave me the error and I was absolutely disgusted with it. Come to find out that only the regular 16 scandisks work. So it can not be the little phone card like memory card. It won't work!

Well what can i do if the SD card its not damaged, and i can read EVERY picture on it, but i cant use it anymore to record pic because in last xmas, we took it out to download some pics and then someone sits on it dismantling it (or destroying the external flat surface) but i think theres something missing inside the SD card cause i cant unlock it anymore and the plastic tab doesnt even touch the memory at all, the side lock switch just slides up and down but no direct contact with the electronic component, im wandering if something is missing to unlock the SD.. anybody can help?