If you only want to crate or edit an icon, you do not need to open Photoshop for this. Photoshop is a heavy photo editing tool. So, you should try to avoid it for small tasks. If you have work only with icons, You can use Junior Icon editor. This is a nice tool that lets you instantly crate new icons or edit icons you have in your system.Junior Icon Editor comes with nice features and is available for free. You can download it and start using for your icon editing work. Before creating a new icon, it will also you few parameters about the icon file you are going to create. These parameters include size, conversion mode and colors. Standard sizes from which you can choose are icon are 16×16, 32×32, and 48×48.
UI of the tool is simple and you can use it easily if you have ever used MS paint program. You can made an icon using pen, brush, airbrush, ellipse, rectangle, line and curve tool. You can also import any existing image and covert it into icon.
At the left side of the tool, you will find tool kit and at the right side, it has color box. Select tools and colors to start editing your icon. At the right side of color box, it also display the preview of your icon.
It also comes with few ready-made icon sets. You can select icon from that set and edit according to your need. But ready-made icons are not free and you will have to purchase it from official website.
I tried creating icon and found that zooming the work area helped me a lot. I was able to work on pixel level while crating icon.
Overall, it is a nice application designed for those who want to create new icons quickly. The tool is available for and supports all available Windows platforms including Windows 8, 8.1, 7, Vista and XP.