In the world, computers are playing a leading role. Computers are used for surgery purposes, for monitoring the robots and in all governing services. Computer should have features based on their serving environment for example a business computer should have minimum 512 ram but it is not enough for gaming computer. Building computers with concern on their need is easy and there will not be any confusion. If any body wants to build a computer, they can get ideas from how to build a computer web server. How to build a computer will clearly explain the basic factors which should be kept in mind while purchasing or designing a personal computer. Searching for details in the internet will also help in building a computer. Each and every year a brand new product has been invented and they are met for sale. The operating system, which is the main user interface, is also an important factor. Microsoft had now introduced a new type of operating system called windows Vista. The graphical user interface in vista is good. There are so many cracks and patch in the internet. Some will install patch without having any listed problem in the patch, in that case it may cause some unusual shutdowns. A system is a good system, if the hardware and software in that system go hand in hand and serve the user in a sweet way.