Keďže máš 32-bit - potrebuješ 32-bit TWAIN ovládač.
https://www.canon.co.uk/support/consumer_products/products/scanners/lide_series/canoscan_lide_210.aspx?type=drivers&language=EN&os=Windows%207%20(32-bit)
kozakl ťa naviedol na 64-bit ovládač a ten nepôjde v 32-bit Win 7!