Canon imageCLASS MF3110 Software Manual page 146

You tried to create a multipage PDF, but were not able to scan several documents.
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Computer has hung up or frozen.
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4-8 Scanning Problems
3. If [WIA Canon MF3110] (Windows 98/Me/2000: [Canon MF3110 Twain
Driver]) is present in the [Scanners and Cameras] folder or dialog box, the
machine is recognized. If not, remove the software (see "Uninstalling and
Reinstalling the Software," on p. 1-10), then reinstall it (see "Installing
Software on Your Computer," on p. 1-4.)
Is the [Automatically Quit ScanGear MF after Scanning] checkbox in
[Preferences] checked?
Click a button on the MF Toolbox and in the settings dialog box, select [Use the
scanner driver to make advanced settings]. When ScanGear MF opens, if you
scan with the [Automatically Quit ScanGear MF after Scanning] setting selected
in [Preferences] of Advanced Mode, only the documents placed at one time on
the platen glass will be scanned. If you want to scan additional documents,
clear the [Automatically Quit ScanGear MF after Scanning] checkbox before
scanning.
Is enough memory loaded in your computer?
Quit other opened applications and try again.
Is enough space available in the hard disk?
Check that hard disk has enough available space, in particular when scanning
large documents at a high resolution. For example, an LTR-size document
scanned at 600 dpi, full color requires a minimum of 300 MB of disk space.
* If you do not have enough available space, scan the document at a lower
resolution.
Does an error occur when scanning an image in Photoshop?
Change the allocated memory. On the [Edit] menu, select [References] ➞ click
[Memory & Image Cache]. Change the [Physical Memory Usage] in a range of
approximately 10% to 20%.
Is the driver installed properly?
Remove the software (see "Uninstalling and Reinstalling the Software," on p.
1-10), then reinstall it. (See "Installing Software on Your Computer," on p. 1-4.)