Here's how to quickly hide all your desktop icons in Windows 7
A very messy desktop... =p
Right click on an empty space on your desktop, select View, then select "Show desktop icons"
After doing this, it will unchecked the "Show desktop icons".
The results is as picture below.
No more messy icons..!!! :)
To know more how it works, just view the video below which I've created.
Hope it helps..!! :)