No need to install other software, download 2580DRIT_V18.exe and 2580JOB.exe from Canon's site. The page as of today is Canon U.S.A. : Support & Drivers : imageFORMULA DR-2580C Compact Color Scanner
NOTE: If you have Windows 7 x64, use the drop down on the download page to select "Windows Vista (x64)". Then, you will see both of these files. If you select Windows 7 in the drop down, you won't see teh JOB tool. This is important.
Next, double-click each file and they will extract. Find the extracted setup.exe files for each. Run the setup.exe that came from 2580DRIT_V18.exe FIRST. Then run the extracted setup.exe from the 2580JOB.exe.
Then turn on the scanner and then plug it into your computer via USB.
Open the Job Registration tool and setup how you want to program the quick access buttons on the scanner (for instance, .pdf, black and white, destination path for the image, etc.).
Load your doc in the scanner and press your preset button, and you're off to the races.
This scanner does indeed work with Windows 7 x64, and no other crappy software is needed. Hope this helps somebody.