Hi Turks-Rude,
Get a Win98 Boot disk and boot from it. From the command line type in fdisk. It will give you a simple menu where you could just follow it and format your hard drive.
Once you formatted your hard drive boot the PC with the WinXP CD. (Make sure you have boot from CD Rom before Hard drive enabled in the BIOS) Then follow the install setup.
And your question about having a problem with the WinXp CD, you shouldn't have a problem unless someone has the same CD Key as that one.
Get a Win98 Boot disk and boot from it. From the command line type in fdisk. It will give you a simple menu where you could just follow it and format your hard drive.
Once you formatted your hard drive boot the PC with the WinXP CD. (Make sure you have boot from CD Rom before Hard drive enabled in the BIOS) Then follow the install setup.
And your question about having a problem with the WinXp CD, you shouldn't have a problem unless someone has the same CD Key as that one.