First you will need to download fuse (
http://fuse.sourceforge.net/) and ntfs-3g (
http://www.ntfs-3g.org/).
Extract fuse, cd into the directory and issue
./configure && make && make install. Once that is done do the same for ntfs-3g.
Once you have fuse and ntfs-3g properly installed, you can now mount the Windows partition. Normally, I issue the following commands. If your disks are listed as /dev/hd(x) as opposed to /dev/sd(x), then change as appropriate. Likewise, make sure you use the proper partition number.
mkdir /mnt/windows
mount –t ntfs-3g /dev/sda1 /mnt/windows
cd /mnt/windows
To make the mount automatic, modify your /etc/fstab to read similar to the following.
# Mount Windows NTFS partition
/dev/sda1 /mnt/windows ntfs-3g defaults 0 0