One thing that you might try is installing SP2 before you install any drivers. I reinstalled a machine last night, and the wireless NIC refused to work unless I removed the driver and reinstalled it after installing SP2. So, for the safest install procedure, download the
SP2 installer, get the installer on some type of media that you can load on the machine after the fresh install (burned CD/DVD, flash drive, etc); do a fresh install of XP, install the SP2 update next; install the motherboard, video, audio, network, etc drivers; and proceed from there. It's often the case that a machine will have driver conflicts after the update, but there seem to be fewer if you add the drivers after the SP2 update.
If you install XP to machines frequently, keep the SP2 installer handy. Doing so will save you much grief in the future.