Log in your Ubuntu system and check Windows partition

sudo fdisk -l

You will have this kind of output:

/dev/sda1               1         262     2098176   27  Inconnu
/dev/sda2   *         263        3194    23551290    7  HPFS/NTFS
/dev/sda3            3195       30402   218541057    5  Etendue
/dev/sda5            3195        5684    19999744   83  Linux
/dev/sda6            5685        5809      999424   82  Linux swap / Solaris
/dev/sda7            5809       11888    48827392   83  Linux
/dev/sda8           11889       30401   148705641    7  HPFS/NTFS

So Windows partition is under /dev/sda2. Let create a directory available in windows:

sudo mkdir /mnt/windows

Let's mount the resource:

sudo mount /dev/sda2 /mnt/windows

This directory will now show files from Windows.