hmmm ... probably you need to check if your graphic card have OpenCl platform to use guiminer, panther ... since guiminer is using OpenCl platform if I'm not mistaken ...

You can check your graphic card with GPU Caps Viewer ... and here is the download link:

http://www.geeks3d.com/20091228/gpu-caps-viewer-1-8-2-available/

mining bitcoin is hard nowadays ... should go with mining litecoin in my opinion ...

good luck panther ...