How to make excel open in different windows excel 2010

Hi guys, how in the world do you get excel to open in different windows. i had this before but after i formatted my pc and reinstalled office my excel files would all open in same window. And no im not talking about task bar. I mean that If i have excel workbook 1 open and then i want to open a completely different workbook that it would open in same window overlapping previously opened one. I can' move one to the left and other to the right of the screen, etc.

I can do this at work just fine. but my hope pc doesnt do it.

I have office pro 2010

im attaching a few pictures. i made 3 files called book1, book2, book3. as you will see they are all opening in same window.

the only way i can open in different window is if i right click at taskbar on and click to open new excel 2010, that opens a different window and then inside there i can go to open and open a file in that other window
but this is annoying as heck. i want to be able to double click any excel file and have it open in its own separate window.

thanks guys3.JPG