Stuffing a load of fans into a computer case won't necessarily do anything to the temperature. The positioning and direction of airflow of fan(s) has to be carefully considered for them to do anything useful.
The convention is to draw air IN at the front, low down and draw air OUT at the back (about level with the CPU). The fan attached to the CPU normally blows air ON to the heatsink.
Regarding you second question, have you tried right clciking a blank area on the desktop, clicking "Arrange icons by" then ticking "Align to grid" (or any of the other options)?