Would sound like u have downloaded an incorrect or incomplete driver.
Have u tried to deinstall driver and then reinstall in case its missed some part of the file.
The symptons are where the h/ware and s/ware on boot up do not see each other.
Would sugest u re-download the drive again in case of missing data on first attempt.
Does the printer show ok in device manager after driver is loaded and works alright, and does it still show ok after reboot...?