Windows users can auto arrange their desktop holding F5 key.

Pressing F5 key once will refresh Windows 7 desktop. Additionally holding down F5 key will trigger Windows 7 automatically arrange desktop icons.

It is a common habit for Windows users to save anything on their Windows 7 desktop. Of course after sometime this habit causes a mass of icons on users’ desktops. So Windows 7 users who has icons everywhere on their desktop can press F5 and hold down F5 key to let Windows automatically arrange icons for them.

The formal way of auto arranging icons on Windows desktop is a right-click on an empty area on Windows desktop, then to select Arrange Icons by > Auto Arrange in Windows XP or right click on desktop then select View > Auto Arrange as in Windows Vista. 

Of course to hold down F5 key is an easier solution then following the menu paths for arranging desktop icons automatically.