There is nother method too, which is not mine but found while googling.
Though the above mentioned method is very easy, not require so much effort and suitable for newbies...
Following method requires a bit expertise.
Quote:
Installing Windows® 98
1.) Use a Win98 Setup CD to boot your computer.
2.) Proceed with the install. When prompted for the install location, you'll see C:\Windows.000. Choose Other directory not the same directory on which ur XP is installed and change this to the drive you wish to install 98 to and name the folder Windows (or something else if you prefer).
3.) Complete the Win98 install. Allow the computer to boot into Win98.
Now u'll not able to boot into XP cauz the Boot loader will be overwritten.
Repairing the Windows® XP Boot Loader
1.) Again boot with Win 98 Setup CD.
2.) Create a Notepad file with the following entries, exactly as shown:
L 100 2 0 1
N C:\BOOTSECT.DOS
R BX
0
R CX
200
W
Q
3.) Save the file as READ.SCR
4.) Now in Command prompt type
DEBUG <READ.SCR
Steps 1 - 4 create the BOOTSECT.DOS file needed to boot Win98. You may need to use the ATTRIB C:\BOOTSECT.DOS -S -H -R command if BOOTSECT.DOS already exists and you get an error when trying to recreate it.
5.) Insert your XP CD and boot from it.
6.) You'll see some files being copied, then you'll be presented with a choice of installing or
repairing an existing installation. Choose Repair.
7.) You'll be asked which XP installation you want to log into. Enter 1. There is usually only one installation.
8.) You'll be prompted for the Administrator password. For Home, the default password is blank, so just hit Enter. For Pro, enter the same password you did during setup for the Administrator account (this is not the same as the password for an Admin level account. It must be the Administrator account password).
9.) At the C:\Windows prompt, type FIXBOOT. You'll be prompted to confirm. Do so.
10.) When FIXBOOT is finished, remove the XP CD and type EXIT and the machine will reboot.
Reconfigure your computer to boot from the hard drive if necessary.
You will now get the XP Boot loader with your choice of operating systems.
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Source :
http://www.petri.co.il/install_windo...windows_xp.htm