Ok got a miner downloaded. When I click the executable I get json rpc call failed. I try to use a command line like I did for xpm and it doesnt recognize minerd. Heres the line I am trying

 C:\minerd.exe -a quark -t 8 -o http://qrk.coinmine.pl:6010 -u xxx -p xxx


Can someone help me here. I am an almost total noob to mining but would like to learn. Thanks!