unmount the windows partition and put this in your /etc/fstab:
/dev/sda1 /home/your username/windows ntfs-3g rw,exec,uid=1000,gid=1000,umask=0000 1 2
Remember to make a windows folder in your home directory first.
Reboot or use mount -a.
You may still find that you aren't getting the expected permissions, if so:
chown -R username:username /home/username/windows