Laptop screen problem

JB03

Right off the assembly line
I purchased a Acer 5742g i5 processor laptop in August. It is equipped with a gt540m Nvidia graphics card. I formatted it once and installed a new copy of Win7 along with all other drivers. Recently i have noticed 3 to 4 green coloured dots on the screen.These dots are visible in all applications including games. However when i take a screen shot of the screen and magnify it in MS Paint, these dots are not visible.Also the laptop tends to heat a lot. Please help me.
Thank you.
 
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