To remove he write protection:http://www.tomshardware.com/forum/272402-32-flash-drive
To format the pen drive:
My computer=> right click your drive=> Format => Quick FormatNote
: After removing the write protection, you are supposed to back up everything important inside it in case of data loss. But, if you still cannot access the inner data anyhow, you could try a pen drive recovery freeware
and then back up it well.