Screen Resolution help in crossfire

Okay, I have a brand Toshiba Satellite L505D S5992 15 6 Widescreen Notebook Computer With AMD Turion II Dual Core Processor M500 by Office Depot Toshiba laptop. Check this link to see what I have:

Basically, 3GB DDR3 ram, 3600 frontside bus speed, ATI Radeon 4100 graphics 15.6" widescreen laptop.

So here's the question, why in Crossfire will it not let me use the widescreen setup? When I try, it says my monitor doesn't support widescreen. So, my screen is tiny compared to my older computer. Makes it hard to play the game. While the game runs great now on high resolution, it won't run widescreen. Does anyone know if there's something I need to do to make this work? Seems it should with this computer. It's wicked fast compared to what I used to have. Any help would be greatly appreciated.