1. Open Start Menu >> Run, type regedit and press Enter, this will open the registry editor.
2. Navigate to the following path:
Note: If the registry key StorageDevicePolicies key does not exist, you will need to create it
Download this batch file called add.bat , and double click after download the key will be automatically added to registry.
http://www.MegaShare.com/769853 - add.bat
3. Double click the key WriteProtect in the right pane and set the value to 0 in the Value Data Box and press OK button
4. Exit Registry, restart your computer and then again re-connect your USB pen drive on your computer. That is it, done.