Ef oh - if you make a post from the point of a 757 driver then you should really put a bit more thought into it. The GPWS is nothing to do with the situation (ie. flaps in landing config, no gear down), its just a Landing Config Warning, and goes a little something like this -
master WARNING light illuminates
CONFIG warning light illuminates
aural warning siren activates
the GEAR NOT DOWN EICAS warning alert message is displayed
its in Vol 2 15.20.10 of your companies ops manual.