Ok since is seems like you are sitting at your computer. Download this
RUU_Rhodium_W_Sprint_WWE_1.21.651.3_RS_1.96WF_NV_S PCS_1.42_0430_PRL60652_Ship.exe then put your phone in boot loader mode. Turn phone completely off....hold down the volume down and hit and hold the power button (button on TOP of your phone) it should startup in bootloader mode, then connect the usb from PC to phone. Double click on the Sprint shipped rom (its an exe file) and it should run. Simple as that, no need to extract the nbh and rename it. You DON'T have to have activesync running or anything like that. Hope this helps a lil