HOW TO: Partition and Format a Hard Disk in Windows XP
You will need to boot to the Win XP CD.
"If an existing Windows XP installation is detected, you are prompted to repair it. Press ESC (do not repair).
All existing partitions and unpartitioned spaces are listed for each physical hard disk. Use the arrow keys to select the partition or unpartitioned space where you want to create a new partition, and then press D to delete an existing partition or press C to create a new partition using unpartitioned space. If you press D to delete an existing partition, you must then press L (or press ENTER, and then press L if it is the System partition) to confirm that you want to delete the partition. Repeat this process for each of the existing partitions that you want to use for the new partition. When all the partitions are deleted, you can then select the resulting unpartitioned space and then press C to create the new partition.
If you want to install Windows XP, use the arrow keys to select the partition you want to install Windows XP on, and then press ENTER. If you do not want to format the partition and install Windows XP, press F3 two times to quit Setup, and then do not continue with the following steps. In this case, you must use another utility to format the partition.
Select the format option that you want to use for the partition, and then press ENTER. The options are:
Format the partition by using the NTFS file system (Quick)
Format the partition by using the FAT file system (Quick)
Format the partition by using the NTFS file system
Format the partition by using the FAT file system
Leave the current file system intact (no changes)"