Ok first I'd start by saying hello, and that I'm not the best at the software side of building a pc I'm more of a hardware person, so I'm close to buying a new operating system for my new build but I don't know whether to choose OEM or the full retail of xp as I don't have the need for vista yet. So my first choice was to get xp pro OEM which is sub £100, but after reading on a different forum saying that you cant change the hardware on OEM it got me a bit worried as I'll probably upgrade the CPU and motherboard in the first 12 months so would it be wise to step down to xp home retail which is a stretch for me at £170ish which should allow me to change hardware if when needed??