My E5-575 four months old became too slow and have a tiny red dot in the screen.

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I have a E5-575 laptop (4 months old) which I use mostly for navigate through the internet. After a couple of weeks this machine became too slow until the point that it is almost impossible to do something on it. For example when I click on the start bottom I have to wait some times until more than 30 seconds to open the window with the main menu. I feel like I am using a machine from 90's. By the characteristics of this machine I would expect it to have a decent performance. In addition, recently a tiny red dot appeared in the middle (bottom) of the screen. I am very disappointment with this purchase. Any suggest to solve these issues?