First of all you have to determine what type of filesystems you have under windows. Is it NTFS or FAT32? The simplest way to find this out is to open a terminal(console) in RedHat under System tools --> Terminal.
Once there type:
su
(this will change you into root user and will prompt for a root password)
Then what you have to do is see what partitions you have. Just type:
/sbin/fdisk -l
(this will produce something like /dev/hda1 ............ NTFS or W95 FAT32.... or something, then /dev/hda2 ...........NTFS or W95 FAT32 or Linux...)
What you have to look for is the partitions which are type NTFS or W95 FAT32, because these are the windows partitions. As you say there are three, there must be three
Look at the devices they are on and remember them and the filesystem types associated with them. For example, if a line says /dev/hda1 ........ NTFS, this is what you must remember /dev/hda1 (the device the partition is on) and NTFS (filesystem type).
And we come to the mounting of the partitions. Depending on what RedHat you have, you might or might not have NTFS support. If you have RH9 then you don't have NTFS support, thus you can't mount or use the NTFS partitions for now. If this is the case, visit
http://linux-ntfs.sourceforge.net/rpm/instructions.html
and please read through the page as it will explain to you in easy steps how to mount NTFS partition and how to configure your fstab to automount it at startup. So if you have NTFS, my help ends here, as it is unneeded, because you will get all the help on that page.
In the other case, if you have W95 FAT32 partitions, you are one step away from using your windows partitions. Remember the device names and filesystem types?
You will need them here. Still in a terminal logged in as root:
mkdir /windows1
mount -t vfat /dev/hda1 /windows
This command will mount the FAT32 partition from /dev/hda1(which means harddisk 1, partition 1(which is C: if you installed windows on a formatted harddisk)) in the directory windows1 created with the previous command mkdir. Now you are able to see the files on that partition. just open konqueror, navigate to / and from there to /windows1 and you will see the file structures of the windows partition. REMEMBER, this works only for FAT32 or if you have Fedora 1 or 2, NOT IN RH9 by default.
Good luck! Peace!