is your windows partition FAT or NTFS? If its FAT then its very easy to mount and have read/write capabilities with the partition. Here's how.
first create a directory where you want to mount your windows partition. example, mine is at /mnt/windows.
then add this line to fstab:
/dev/hda2 /mnt/windows vfat auto,users,rw,umask=000 0 0
take note that the number 2 in /dev/hda2 means that the windows partition is the second partition of the first hard disk. you should change this to reflect your windows partition number. if unsure, type "cfdisk /dev/hda" at the commandline. this utility is similar to fdisk in windows. it should show a table about your partitions. WARNING! do not mess with cfdisk if you don't know what your doing. it could render your system unusable. just look at what you need to know then exit.
its a bit tricky with NTFS. i was able to mount it with read-only capabilities back then with slackware 10. here's how:
create a mount directory then add this to fstab:
/dev/hda2 /mnt/windows ntfs auto,users,ro,umask=000 0 0
for more information with NTFS and linux, try http://www.linux-ntfs.org/
i hope this helps. good luck!