Canoscan 8800f error as ''cannot connect with scanner''

I had the same problem with a new canoscan 8800f. I found by connecting the scanner USB lead to a USB 1 .1 port instead of a USB 2.0 port the problem seems to have been was solved. I was fortunate to have both. Originally it was just USB 1.1 ports on my PC, but I added USB 2.0. I don't know how you solve the problem if you only have 2.0 ports.