Try this procedure

a) Download xPUB from http://www.xpud.org/
b) Burn it on a CD and reboot from the CD
c) Your hard disks partitions should be under file manager's mnt folder
d) To mount your USB, choose Tools->Open Terminal, type in the windows three commands as follows :

sh-4.0# fdisk -l

Disk /dev/sda: 320.0 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 2 2551 20482875 c Win95 FAT32 (LBA)
/dev/sda2 2552 5101 20482875 7 HPFS/NTFS
/dev/sda3 5102 7651 20482875 83 Linux

Disk /dev/sdf: 1034 MB, 1034944512 bytes
32 heads, 62 sectors/track, 1018 cylinders
Units = cylinders of 1984 * 512 = 1015808 bytes

sh-4.0# mkdir /mnt/u*****
sh-4.0# mount /dev/sdf /mnt/u*****

Your USB content is in the u***** folder.

e) Now you can copy (with the mouse) files/directories in your hard disk and paste onto the USB.
f) Chinese characters display fine in xBUD, but don't show properly in Windows. At least, you get your files back.