I have Windows vista on hda1.
As you said i installed Fedora by creating partitions / - ext3 on hda2 and a swap partition on hda3.
By doing this i got a new boot loader( i think it is called as grub) and got two options for selecting windows vista and also fedora 11.
After going through fedora, i installed Redhat on hda5 by creating / - ext3.
Upto now i didn't get a problem. But after rebooting the redhat i got only two options showing "other and Redhat".
When i tried boot from other i am able to access windows vista and through redhat option i can access redhat.
What happened to fedora Installation and how can i access Fedora ?

It looks like the Red Hat installation replaced your boot loader, please try these steps to get your previous version back:

- boot into Red Hat and copy/print /boot/grub/menu.lst
- boot on the Fedora cd/dvd and select rescue mode
- ensure that it locates the Fedora installation not Red Hat
- run the suggested command 'chroot /mnt/sysimage'
- run 'grub-install /dev/hda'
- reboot, you should have your Fedora/Vista boot options back
- boot into Fedora and edit /boot/grub/menu.lst
.. add a section for the Red Hat installation (read it from the backup in step 1)
- save, reboot, you should now have 3 boot options

let us know how you go

cheers,

kbp