The PACE system files need to be updated. - Download the PACE System Files Setup.exe from www.paceap.com Run PACE System Files Setup.exe If you tried to install the Authorization from the keydisk you could also experience error - 108, - 4105 or ID: eDrv : 310 / BlkD : 3. If you ran the DeAuthorizor from the key disk, you will see a file in the "copy to DeAuthoriztor to hard drive" folder that is titled "Paceilui.dll". Trash this file and follow the install instructions.INSRUCTIONS: On windows you need to copy the DeAuthorizor to the hard drive (from the floppy the open the folder labled "copy DeAuthorizor to hard drive"). - Copy the item to the desktop - Double click the icon to run the DeAuthorizor. - Follow the on screen instructions