Desktop Computer

I need your help! I am writing here from my friends computer because I smell some traffic at this site, I see people are reading this site. My computer broke! My NETBOOK broke. I was looking at many places and I am so confused what to select. I don't know much about COMPUTERS, I feel so dumb and don't know where to BUY REFURBISHED COMPUTER. I found lemanskef.blogspot.com (you can see it here, - but they have so plenty of them so I am really confused what to buy. Can you please help me and tell me what to buy? I just did not see other stores then fashionlaptops.com site with a big choice. Please help to select something good and cheap. Thank you!