You can use attribute command to see back your file(s)
just open command prompt
To open Run dialog, press Windows Key + R
Type, CMD to open dos command screen
Find out your memory stick's or Pen Drive's name as below..
Now see you memory stick's (Flash Memory's) disk drive name from My Computer or This PC or Computer, they are like (C:, D:, E:, F: etc) memory stick's or pen drive's name comes after Fixed HDD's and CD ROM's Name.
ie. if you had one HDD and one CD ROM, it means C: and D: respectively for HDD and CD ROM and than E: set's for your memory stick or pen drive.
Now go to CMD screen, what ever you see ignore all of these.. and type E: and press enter
it change to C: to E: like E:\>
attrib[Space]*.*[Space]-r[Space]-h[Space]-s[Space]/d[Space]/s and press enter
wait for a moment
after you see E:\> in CMD screen open your memory card from my computer.. you can see one new folder without name... open it where you can see your all files and folder...