Hello my name is***** look forward to assisting and am very sorry to hear that you are having this problem.
Go to this page:
Scroll down below the image and click drivers to expand it.
Download and install driver ver 2.56
If you have any questions at all click on reply to expert and let me know. If not please don’t forget to leave a positive rating for my help - it is greatly appreciated. Please note you are rating me only not this site or your Canon.