Back up as much as you can from your data. This method is used to install a fresh copy of windows XP and performs a format that removes all your programs, drivers and any personal data on the C drive.
The first step is to insert your windows XP installation disk into your CD drive. Make sure that your Bios settings are set to the first boot device to be your CD drive. After some loading you will find on the screen “ pres any key to boot from CD….” Press any key to start booting. The CD will load and you will find a blue screen you will find three options choose “ press Enter to set up Windows XP”.
Now you will enter a screen where you select the partition that you want to install windows on and you will find other options like format drive and delete partition. You will find all your partitions listed with their volume name and their drive letter. Chose the partitions that you want to format or the partition that you want to install a fresh copy of Windows on. If you chose to install your windows XP on C: ( recommended) you should choose “Delete Partition” after doing so you will find it space as unallocated disk space. Your next step is to make a new partition by pressing C for creating a new partition with the maximum available disk space ( automatically adjusted).
Your next screen is the choice of file system where you chose NTFS that is most recommended for Windows XP and later operating systems. After you chose your file system you will wait till your disk is formatted and your setup process will start loading files and you will be guided through the rest of the simple and easy installation process.
In this Un partitioned Space you should Create your partitions which will be further formatted and one of them will be your primary partition that will contain the operating system.