Flash drive that is removable disk

Hello every one,

I have a problem with my flash drive or usb. when i restarted my computer it just appear that my flash drive is removable disk. i try go to administrator account and go to my computer then manage then disk management. i try to change the letter and paths but it did not work.
Please help me with this problem because i need the files on my flash drive because i did not buck-up it.
Any help will be appreciated.
Thanks a lot.