Acer 5220 extensa

Question

I have had my acer extensa 5220 for less than 1 week and now I am having major probs in when I am typing in any programme the cursor keeps skipiing everywhere making a nonsense of any work and takes 3 x as long as I keep having to make corrections.Also I am constantly seeing a message on screen from msoft -internet explorer asking if I want to run ActiveX or plug ins. When I use the mouse pad it just has a life of its own thanks for any help