A hotfix for PerfectDisk 12.5 that will allow it to run on Windows 8.1 is now available. This hotfix will only apply if the following conditions are met: •Windows version is an RTM release of 8.1 or Server 2012R2 (6.3 Build 9600). Preview builds of Windows 8.1/Server 2012 are NOT supported. •PerfectDisk 12.5 Build 312 is currently installed. This hotfix will NOT install PerfectDisk 12.5 Your computer will be restarted after installation of this hotfix. Hotfix can be downloaded from: hxxp://update.raxco.com/pub/download/pd125/client/PD125HF10.exe Save the file to your desktop and Run as Administrator in order to install the hotfix. Upon successful installation of the hotfix, your computer will restart. Support for Windows 8.1 is still planned for the PerfectDisk 13 release. I hope above info is useful.