I have installed the Fedora Core 4 on my machine in dual boot mode with Windows 98 as the other operating system.

I had done the minimal set up of Fedora core 4. Know I am able to log in to fedora with root as the user and also boot into windows.

Please note that minimal set up doesn't installs x windows

Know I want to add other packages like GUI to Fedora core. Can anyone guide me how to do this?

I don't know how you installed FC4 without X-Windows and a desktop manager. FC4 is a four CD set and you have to purposely choose not to install X-windows or a desktop manager. If you only had one CD, it was probably boot.iso which is used to install FC4 from the internet. Fedora doesn't recommend this for the novice.

My advice to you would be to start over with your Fedora install. This time install GNOME or KDE or both. Here is a link where you can get all four .iso images if you don't already have them.

Thanks for the quick reply. Well while installing FC4,you get the option to choose what packages you need to install. At the bottom of that screen, there are two options: Everything and Minimal. I choose Minimal, since I am facing problem with burning iso's to cds.(My disk 2 was corrupt though disk 1, 3 and 4 are fine).
This minimal set up installs the minimal FC4 without any x windows or GUI env.

Well, my advice would still be to find disk 2 and burn it, then reinstall. You'll probably spend less time getting a working disk 2 than you will installing X-Windows and a desktop manager.

Many Thanks Arrow for your interest in helping me. I was able to install FC4 on my machine successfully last night.
But instead of burning the iso to another CD, what I did was to choose the installation from hdd. Here are the steps that I followed:

# Boot from the bootable CD 1.
# At the prompt type : linux askmethod.
# It will load something and ask you few questions like language, keyboard etc and finally ask you the installation method like cdrom, harddisk, ftp,http etc.
# I choose HDD
# Then it asked me the device(partitions on HDD) and the directory where my iso files were lying.
# Once it picked the iso files, the rest of the installation was similar to installing from the CD.

Well, that works too. Congrats and enjoy.