Installation instructions can be found on the installer CD case, and on the Saffire PRO downloads page on the Focusrite website. Please read the installation instructions carefully. PC USERS - To prevent Windows from attempting to install the wrong drivers, you should only attach the Saffire PRO 26 i/o when the installer asks you to do so. Connecting the device before this can result in improper installation of the device drivers. You will be told that driver you are installing is not signed by Microsoft. Click 'continue anyway' when this window pops up. If this window pops up and you accidently click on annother window, use the ALT+TAB keys to scroll through windows.