system requirements for computer

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I'm thinking of getting my own personal computer since I left my old one at my family home for my brother to use. My friend advised me to have the set assembled instead of buying an package because you can specify the parts, the brand, and in the long run you get better quality for the same or a lower price. But I still don't know what system requirements to specify. I need to be able to do the following: surf on the Internet, play games such as Emperor and MU Online, work with / layout graphics and text, play video and audio files.