2. Windows can all write protect flash drives. Check out this registry path,
You may find a key here on the right side by the name 'WriteProtect'. If it's not there this would not be the cause of problem. If it's there, make sure that the value is 0.
Use this utility.
It is very good. You may have to use it 2-3 times. Each time safely remove . Again start utility exe file.