Here's a look at what you need to know, and the steps to take to make the process as easy and seamless as possible. The main thing to know is that, unlike upgrading Windows 8 to 8.1, your files and data will transfer, but you'll need to re-install all of your software applications. However, there are a few things you need to know before going ahead with the upgrade. If you're currently running Windows 7 and want to upgrade to Windows 8.1, the process is relatively easy using Microsoft's Upgrade Assistant utility.