USB Flash Drive Data Corruption Issue

Hello,

I have used my USB flash drive for several years now without any problems, however, when I inserted my flash drive today it came up as 'Removable Disk D' instead of its usual name, in addition, when I attempted to access it, I was faced with the message 'In order to use this disk, it must first be formatted'. I can now not access my files on the memory stick, and I cannot see what to do to fix this. I have attempted to scan and fix, but this also requires the disk to be formatted. I have a number of very important files that have consumed many hours of my time on this memory stick so I really need this issue to be repaired.

Thank-you in advance

William