Welcome to the forums
Was your XP 64bit by any chance?
If so, that uses a different driver;
PIXMA Pro9000
Number 3 on the list, is the one you want.
Instructions to install;
PIXMA Pro9000
If you've already done that, I'd uninstall and then install it again.
You may need to boot the computer before the printer will work, even if it doesn't tell you too.