umm actually working with your NTFS partition is quiet dangerous and not recommended! But if you still want to do so. Then you should create a directory like /mnt/ntfs in order to mount the partition. Then do a:
mount /dev/your_ntfs_partition /mnt/ntfs
If there's an error and the partition isn't mounted this means that you have ntfs support disabled in your kernel. Still I suggest you create a FAT32 partition for exchanging your files between Windows and Linux and store your movies, mp3s and documents there. Good luck!
P.S. If you screw up windows please don't blame me