first of /dev is a device directory not a folder as such, in linux you mount filesystems into a directory.
so first off create a windows folder in the /mnt directory
if you want other users to access it use
chmod 777 /mnt/windows
this allows every user to write, read and execute from it
so you mount line should look like this:
mount -t vfat /dev/hda1 /mnt/windows
note this is if you windows partition is formated in fat32
windows xp if usually NTFS so you have to use this command
mount -t ntfs /dev/hda1 /mnt/windows
if u are running red hat 9.0 you have to download the ntfs driver here:
you probably want the i386 2.4.20-8 rpm if you havent upgraded your kernel.
note also that you can't write to NTFS from linux, you can only read from it
any probs just ask,
if you want to know how to automount, just ask