I am totally agree with TheMajor.
It is always recommended to use assembled PC and if it is assembled by own then it is more recommended. It is so easy to built your own PC once you follow the instruction given on the website;
I recommend the above website because I built my own PC using this website. This website is fully loaded with quality articles on right from "how to build your own computer?", to information on security, phishing, Trojans, Viruses and popular downloads. I bookmarked this website. Really not to miss you must visit this website.