Windows 7 Cannot open/install sims 3

Right yesterday i bought this game & since then i have been trying to solve this problem, i got home put the game into my laptop (2 week old dell inspiron with windows 7) & the usual window didn't pop up like it has with all of the other disks i have put in my laptop (including other dvd's). I then went in to open it manually but it is not recognising a disk. Firstly i know it is not that there is a problem with my laptop as all other disks work on it & secondly it cannot be the actual disc & i have actaully returned 2 thinking that they were faulty, i am now on my 3rd. I have looked at forum after forum & tried all of the relevent suggestions but i don't seem to be getting anywhere. I am about to throw the lot out of the window , so any help would be much appreciated. sorry if ive rambled