Starting Thursday, Microsoft will be releasing its latest update: Windows 8.1. The upgrade addresses some of the problems that many people seem to have. The upgrade adds shortcuts that are easier to use for many touch-based apps while also adding newer features for the desktop mode that so many people have grown accustomed to using. Do you already use Windows 8? Perfect! Then the update will be free for you beginning at 7a.m. Eastern Time on Thursday. Computers with Windows 8.1 already installed will hit the shelves on Friday.