Miminizing windows/Taskbar

Hi all,

I have a problem with my taskbar, every time I minimize a window instead of
minimizing itself on the left side next to the start button, it minimizes
itself on the right side (next to the clock, and what not). Also whenever I
minimize more than two windows I get scrolling arrows in the taskbar, in
order to choose among which one to expand? How do I make the windows
minimize on the left side?

Thanks