Installed MP Navigator from Canon PIXMA MP830 setup CD on a Windows 7 workstation. First error indicates I need a driver. Go out to Canon’s site and download and install the driver. Now the good one… Launch MP Nav to Scan and get scan failed error. Simple fix
Identify the twain_32 folder on your system. Example C:\Windows\twain_32.
Find the subfolder for the device that isn’t working. Mine is c:\windows\twain_32\mp830.
Edit your Environment Variables and Add a New System Variable named Path.
(You can add your new Path to an existing Path with a semicolon)
No reboot required.