Asus Zenbook has blurry icons

It appears as though you've changed the font scaling on your system from the default DPI (see How to Adjust Windows 8 Display Settings for High DPI/PPI Screens for details on adjusting this manually). The side effect of modifying this value is that it will scale everything displayed on your screen, including images and icons.

Unless a high-resolution/high-DPI icon at the proper resolution is available, Windows will scale any provided icon to the correct size, which introduces the artifacts appearing in your attached screenshot. This is a well documented side-effect (and also occurs under Windows 7 and some other OS'es), and is a natural conclusion for displaying content at a non-native scale.