Currently there isn't very good manual available but the best I can offer now is this:
http://www.skippari.net/phpBB2/viewtopic.php?t=471
You don't need to install any drivers. Just extracting the LCDinfo_test.zip and selecting the correct display driver should be enough. Also the default screen from the package is a 84x48 one so you should get some picture on your lcd without any additional configuration besides selecting the correct driver (PCD8544) and restarting LCDInfo. When LCDInfo is started it automatically reads the screens.xml file from the screens directory and starts showing the screens defined there.
So sounds like you could be having hardware problems. You could also try different bios settings for parallel port.