ERROR: No NVidia compatible platform found
windows xp sp3
driver or 306.94
nvidia GeForce 8800 gts

why is it so?
driver problem
on what to change?
I have installed cuda_5.0.35_winxp_general_32-3.msi
this driver from there
If you have more than one VGA card or video out, you have to change "nvidia GeForce 8800 gts" card to main display device.
Do not install CUDA unless you know what you are doing. If you just want to execute CUDA programs like cudaHashcat, the driver ships with all the required files. There is no need to install the SDK