Do you have Windows or a Mac? In both cases the OS will usually recognize a scanner (even as part of a multifunction device) as a scanner, and allow you to use other apps (like ones the OS comes bundled with) to perform scans.
You should install the driver package for the unit first, which is available separately from the bloatware:
Pick your OS from the dropdown, and grab the driver package (and leave the bloatware like EasyPhotoPrint on their server where it belongs). Then install just the drivers and use your scanner with the OS-bundled utility (Windows XP, Vista, and 7 all include one, as does Mac OS).