Disk Error

Any time i insert my card it my pc prompts me i need to format the card and when i click format and follow the few steps formatting, i will tell me the disk is write protected. mean while i bought it new and loaded movies on it for my Galaxy note 10.1 after which the machine always say SD card error and when conected to my laptop to access too, it says disk need to be formatted then whe i try, it tells me disk is write protected. 

Please assist me recover my documnets.