So you have Windows 8 or your computer came with Windows 8 , so why havent you made the move to Windows 8.1
Think of Windows 8.1 as the equivalent of Windows XP Service Pack 2 , they fixed a lot that was wrong.
So how do you get Windows 8.1 ?
First make sure you have done all your Windows updates in Windows 8 and have done all the updates in the Windows Store.
Then open up the Windows store and there should be a an icon to upgrade to Windows 8.1.
Click on the icon and agree and it will start to download. It is a big download ( 3.5gb ) so it will take some time.
Here is a detailed rundown on how to install Windows 8.1 from Microsoft so as i always say make sure you read the instructions.
Here is a link to a Gizmodo article on the changes in Windows 8.1
Windows 8.1 Review