Canon : PIXMA Manuals : MX390 series : Scanner Does Not Work after Upgrading Windows

Check: Disconnect the USB cable, then uninstall (delete) and reinstall MP Drivers and IJ Scan Utility.

Step 1: Uninstall MP Drivers.

See "Deleting the Unnecessary MP Drivers" for your model from Home of the Online Manual for how to delete MP Drivers.
Step 2: Uninstall IJ Scan Utility.
- Windows 7 / Windows Vista:
  1. From the Start menu, select Control Panel > Programs > Uninstall a program.
  2. Double-click Canon IJ Scan Utility.
  3. When a confirmation appears, click Yes.
  4. When uninstallation is complete, click OK.
    
    IJ Scan Utility is deleted.
    
    Note
    
    In Windows 7 and Windows Vista, a confirmation/warning dialog box may appear when installing, uninstalling, or starting up software.
    
    This dialog box appears when administrative rights are required to perform a task.
    
    If you are logged on to an administrator account, follow the on-screen instructions.
- Windows XP:
  1. From the Start menu, select Control Panel > Add or Remove Programs.
  2. Select Canon IJ Scan Utility, then click Remove.
  3. When a confirmation appears, click Yes.
  4. When uninstallation is complete, click OK.
    
    IJ Scan Utility is deleted.
Step 3: Reinstall MP Drivers and IJ Scan Utility.

Reinstall MP Drivers and IJ Scan Utility using the Setup CD-ROM.