First arrange your desktop the way you want and literally all you have to do is press the "print screen" button on your keyboard, located in the top right corner next to your scroll lock usually.
Once you've done that open your "Paint" application or any photo editor or word processor such as MSWord, go to edit and click paste!
There's your screen shot! That's all there is to it!
Paint defaults the file type into BMP but if you do a save as you can save it in any format, most notably JPG which weighs much less than a bitmap. Don't forget to name your file and remember where you saved it to.
I hope this helps, good luck! And keep on skinning!
