Post the output of:
sudo fdisk -l /dev/hda (replace /dev/hda with /dev/sda if sata disk)
cat /etc/fstab
ls -l /mnt
ls -l /dev/hda*

Can you mount with: sudo mount /dev/hda1 /mnt/hda1 -t ntfs (replace ntfs with vfat if fdisk reports FAT32 for hda1)

You can open a konsole under kde for this, highlight command with output with mouse and paste here with middle mouse button.