How to unprotect the Write protected Pen Drive

 Open command prompt (By Typing RUN in the search) window and execute these commands in this order:
1. diskpart
2. list disk
3. select disk # (# is the number assigned to the flash drive, It will be numbered as 1 or 2 or 3)
4. clean
5. create partition primary
6. select partition 1
7. active
8. format fs=ntfs quick

Remove the Pen drive and plug it again.