Aside from all the drivers (which would be supplied with the components you buy) all you need is Windows XP to get it running.
Once it's running, you may have to install hardware related programs, such as graphics card utilities (ATI Catalyst Control Center, for example.)
Regarding system 32 files - reinstalling Windows, even after reformatting the hard drive can leave some windows system files in place and carry previous corruption over to your new install. Google for "DBAN" and use that to format your drive before reinstalling Windows if a "fresh" install fails.
Be carefull with something like DBAN which seems to carry out automatic formating of ''any hard drive it can detect'' much safer to use a windows boot disk and do the formating manually, at least you should be sure what is going to be formatted.
qapmoc is right about DBAN - unless you are totally sure what you are doing with it, try the Windows boot disk first, though there is a specific function in DBAN for setting a disk up for a clean install of Windows, but make sure you don't wipe any slave disks or separate data partitions.