The xp is fast operating System that you can install in only 512 MB ram, installation is difficult, I use xp operating system in my p4 motherboard 4 year ago it is working very fast now there are many software available in market that you cant work in windows 7, windows 8, windows vista, if you want to work that you must install xp, most important is that it is work in only 512 MB ram, now it is old for us but it is also fast for us still some person use xp because it is fast if you want to use fast operating system then I recommend you that install windows xp.