Before upgrading to Windows 8, or before upgrading from Windows 8 to Windows 8.1, it might be a good idea to run the Windows Upgrade Assistant.

The Windows Upgrade Assistant will help users out by simplifying simplify the upgrade process via its step-by-step guide. The Upgrade Assistant will first, check the compatibility of a userís system, making sure that his computer is ready to handle Windows 8. It will then inform a user about any application or device compatibility issues. It will let him know if there is anything that needs to addressed before or after the upgrade and will outline the necessary actions to be taken.

You can download Download Windows Upgrade Assistant for Windows 8.1 by clicking here.

These links may interest some of you:
How to upgrade Windows 8 to Windows 8.1
Windows 8.1 & Windows 8 Upgrade Paths
Upgrade Windows 7, Vista or XP to Windows 8 Pro
How to download Windows 8.1 ISO using Windows 8 Product Key