|my windows vista say arc soft incompatible with it|
Your profile says you use Windows 7 so why do you refer to windows Vista???
Your version of Arcsoft was supplied by Canon with your scanner, so Canon (not Arcsoft) has to offer support and updates for it. If Canon has no updated version, then remove the incompatible version and visit Arcsoft direct: http://www.arcsoft.com/
You will have to purchase software obtained through the Arcsoft website. Only software from Canon is free. However, there are many free image-editing programs which you can download. You don't have to use Arcsoft software. Look here: