If something happened to your xp, (like file coruption) U can also try a Repair Install first (this usually leaves your personal files intact)
For a fresh install:
The first question is, do U have your personal stuff saved? Because a fresh install means formating the partition (usually C) to install windows. (so, back up your data first, on usb sticks, cd/dvds, or if U have other partitions, or another hard drive U can keep your personal files in there.)
(somethimes, U need to put hard drive drivers on your xp cd, depending on what hard drive U have)
U need first to get into the bios and change the boot order (by pressing del or F2 at startup)
Put the CDRom as first boot device, and save changes.
Restart, and press any key when U see the "Press any key to boot from cd..."
Enter the setup, F8 licence agreament, be carefull to format the partition U want to install windows on and start setup.
After setup is done, and U go into Windows, first U should install the chipset driver (the Intel chipset download it from the link I gave), then touchpad , video, sound drivers, (from the same link and other stuff if needed).