MisaTama Draconia

Hello I tried to create a TGA image with alpha channel, but after save my image the color was gone, the part which had color was white. Can anyone help me ?

When I enable shadows, my screen is black and after open a window with message about NVIDIA error code 7. How Can I fix it? I tested Firestorm 4.0.1.27000 oficial second life viewer 3.3.0.251182 CPU: Intel(R) Core(TM)2 Duo CPU E7500 @ 2.93GHz Memory: 2048 MB (DDR3-1333 DDR3 SDRAM) Graphics Card: nVIDIA GeForce GT 240 ddr3 1000 MB Windows Graphics Driver Version: 8.17.12.9610 OS Microsoft Windows 7 Ultimate Anyone Can help me?