Change where temporary files are saved (Toolbox)
For an unknown reason, the computer is not allowing temporary data to be written to the general folder chosen by Toolbox at the time of install.
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From the CanoScan Toolbox, click the Settings button.
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At the bottom you will see a section that states, "Select Folder Where Temporary Files are Saved:".
Click the Browse button.
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Browse to a folder, such as C:\Temp, and then click OK.
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Click OK again to exit the Settings window.
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Try scanning again.