The latest and last drivers for your scanner
Windows Vista 32bit
http://www.canon-europe.com/support/consumer_products/products/scanners/canoscan_series/canoscan_n670u.aspx?type=drivers&language=EN&os=WINDOWS%20VISTA%20(32-bit)
Mac OSX 10.5
http://www.canon-europe.com/support/consumer_products/products/scanners/canoscan_series/canoscan_n670u.aspx?type=drivers&language=EN&os=Mac%20OS%20X%2010.5%20(Leopard)
Do not understand Linux but cannot find any drivers for your scanner, but found this link which you may understand.
http://www.soours.com/wordpress/archives/2007/01/27/wrestling-a-canoscan-n670u-n676u-lide20-scanner-in-edgy/