MP450 User's Guide
Page 116
... and reboot the computer, delete unnecessary files and application programs, and rescan. Then confirm that the machine is identified. ScanGear MP Won't Start Cause Scanner driver (ScanGear MP) is not identified. Only use it. z Open ScanGear MP from within the application program, click the [Preferences] button in Advanced Mode, and... calling up ScanGear MP. Select your computer and install ScanGear MP. Machine may solve the problem. It may not be selected. Problems With Scanning Scanner Won't Work Cause Machine is not installed.
... and reboot the computer, delete unnecessary files and application programs, and rescan. Then confirm that the machine is identified. ScanGear MP Won't Start Cause Scanner driver (ScanGear MP) is not identified. Only use it. z Open ScanGear MP from within the application program, click the [Preferences] button in Advanced Mode, and... calling up ScanGear MP. Select your computer and install ScanGear MP. Machine may solve the problem. It may not be selected. Problems With Scanning Scanner Won't Work Cause Machine is not installed.