Best build for windows xp?

Hi guys, so i am againts the clock here, my stepdad runs a machine shop, and his desktop pc died, somehow i think it got ESD'd and the mobo died, i already check is dead, we changed the mobo and still popping up memory blue screens, i think it also zapped the rams, anyways he wanted to upgrade, the problem is is that the software he uses for his CNC machines has problems to run on Win7, so he finds himself forced to run Win Xp, i know we can get the software to run on Win 7 but is a pain in the ass and it might just not work, so he's againts the time, he needs a pc now, so im shopping for hardware to make sure the software is gonna run we HAVE TO run on Xp, so im wondering what is the best hardware i could possibly get for Win XP? also i am looking for a Nvidia quadro or Firepro, since he runs professional 3d software like mastercam, cad cam, and solidworks, any help is much appreciated

thank you guys for all the replies, regarding the SSD yeah i definitely thought about it, and i purchased a 128gb, it was totally a go, but i decided to dig into it, and it ends up that xp does not support AHCI natively, and if i remember welll you have to choose between run the SSD in IDE OR AHCI MODE BEFORE INSTALLING THE OS? how does that work? so i am a bit confused there as i never installed an os on a SSD, if anyone knows how to install a os on ssd it would be a great help, @zephik i don't know if you really read my post, i said he was forced to use xp because the 3d software he uses has problems running on Windows 7, it natively works just fine on xp, that is why im shopping for old components, anyhow, i already bought the stuff, i was going desperate when i came across with this new MSI mobo, its amazing, i can't believe MSI released a new mobo with win XP support, anyways here's the build i got:

SSD: http://www.amazon.com/gp/product/B004W2JKZI/ref=oh_details_o04_s00_i00

CPU: http://www.amazon.com/gp/product/B005LLBBSS/ref=oh_details_o03_s00_i00

GPU: http://www.amazon.com/gp/product/B0014IVWZ4/ref=oh_details_o01_s00_i00

PSU: http://www.amazon.com/gp/product/B001EYV690/ref=oh_details_o04_s00_i01

RAM: http://www.amazon.com/gp/product/B000VZOX4S/ref=oh_details_o04_s00_i03

CPU FAN: http://www.amazon.com/gp/product/B005O65JXI/ref=oh_details_o04_s00_i04

MOBO: http://www.amazon.com/gp/product/B007QWI9TY/ref=oh_details_o04_s01_i00

TOWER: http://www.amazon.com/gp/product/B004351H9G/ref=oh_details_o04_s02_i00

what do you guys think? i decided to go with this setup because it allows me to upgrade, since it has xp support i can use it for what we need right now and if at any time we decide to give a try to install mastercam on win7 we can get a faster CPU and more RAM. right now im testing mastercam 9 on my 64-bit win7 laptop and see how it behaves, i installed it once on another win7 pachine and we had problems, it has known problems that is why we're going with xp, so we know it is going to work for sure, he needs a pc up and running fast so he can keep on working.

thank you, and yeah, the case was more of a good looking thing than function oriented, but im pretty sure my stepdad will like it, and regarding the memory, would xp support 4gb? as far as i know it supports up to 3gb in some speciall steups, but generally up to 2gb, but if it can address 4gb ill go for it