Hello Frans ,http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=DownloadDetailTabAct&fcategoryid=351&modelid=6622
Select XP as OS ...
I've installed the TWAIN driver , WIA driver and after reboot installed the Toolbox , and after that the scanner is working fine now in Windows 7 32 bit.
Edit : It's not working as it should , because you can't "aquire" a scan trough any program, but you can scan with the "Canoscan toolbox" first (tip : put a shortcut to the toolbox on your desktop ) .
After the scan you can open the image in your image editor.
Good luck , Kuoi