SG Miner and Suprnova

[Dan170667]

Hi.

I downloaded SG miner5. I registered with the Suprnova pool and followed their instructions for setting up the batch file for the miner. It is not working and I get the following message: " You most likely have input the wrong URL, forgot to add a port or have not set up workers."

The following is my batch file: sgminer -k groestlcoin -o stratum+tcp://grs.suprnova.cc:5544 -u Dan170667.Yorick -p milawantsredcake

My worker in Suprnova is activated. I am using Windows 7 and an ATI Radeon HD 4600 series GPU.
I have read widely on the net and cannot find a solution to the problem. Could you please send me the correct version of the batch file to be pasted into notepad, or is there another GPU miner available?

Thank You.