CanoScan LiDE 25 scanner MCI error

Hello, I have just installed my LiDE25 on Windows 7, and when I use CanoScan Toolbox to try to view a preview to adjust the crop, I get a box eltitled "MCI error" which says "Can't find the specified file. Make sure the path and filenames are correct." It performs the preview scan, but the program then freezes. What files are these? How can I correct this error?