The question has been done many times. Too often it's a failing drive. Get your files safe then try that HP USB MEMORY STICK FORMATTER. There are a lot of folk that won't give on a failed stick. You know to let them have some time and space.
How to Remove the write protection from a pen drive.I have tried fixing it using Command prompt-diskpart method and also i have tried fixing it through registry editor but there is no positive result.So please provide a fruitful solution to this problem. Thank You....

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic