How can i repair my flash drive?

Hello,
i have a problem with my flash drive, when i insert my flash drive to my computer, it said that " USB Device Not Recognized", and it said that USB devices attached to this computer has malfunctioned and windows does not recognized it. There's any problem to my flash drive? or the problem is in the port? can you give me some information about my problem, because all my documents and important files are saved in my flash drive. Please help me

Thank you