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It's possible there are no drivers running under W 7 for this remarkable unit and it's a shame . If you have the W XP install disc , you could install a virtual version of W XP on your HDD . You could also partition your HDD and install W XP on the new one . Otherwise ... trashbin . Yes , life is hard . Regards .
The 9420 visioneer Scanner driver will run the 8900 scanner.
first,go to visioneer and download the .MSI file for the 9420. Run it. The driver files will be found in directory: C:\Visioneer\OneTouch 4.0\9420 Drivers.next, find the 8900 drivers.they will be in c:\ Windows\twain_32\vizscan8xxx. open the file and look for rtscan.dll Rename it old rtscan.dll.if you can't find them,either use Device manager to show you where they are. or you can reinstall the Driver(Xp\2000\Me\Win 89 from Visioneer site. Rename the rtscan.dll file which will be in the twain_32 folder(see above).
copy all the files in 9420 Driver file to the c:\Windows\twain_32\vizcsan8xxx folder. turn your scanner on.windows should find the drivers and install the scanner.
This is most likely only happening when attempting to scan through the CanoScan Toolbox. You can scan directly through ArcSoft PhotoStudio which came with the scanner. However, the error through Toolbox is likely caused by some limitation or restriction in the computer, possibly permissions of some sort. You may try deleting temp files from the Temp folder on the hard drive.