look for your nvidia 8800 gts at https://en.bitcoin.it/wiki/Mining_hardware_comparison
Try some options from there.
Also try to use http:// infront of the address.
Download http://www.cpuid.com/softwares/hwmonitor.html and monitor your gpu temp while mining.
The official max temp is 90 it should not be much higher then this, otherwise it will affect the lifetime of the gpu.
I checked out https://en.bitcoin.it/wiki/Mining_hardware_comparison and a few other sites with info and used the most generalized settings that others where using for nvidia 8800GTS card, but still hangs indefinitely when it says starting.....
I downloaded the latest opencl drivers I could find from nvidia, but still having the issue :/