I had problems.
I could not conect mine gps to soft I use and started playing with sirfdemo and killed it but...
YOu can not realy kill it by soft!!
I had to take out batery to cleargps memory. and after that it came back.
Try sirfdemo and see if shows the satelites in sirf mode.
the prog that cames with gps dont show anything for me, but that one works
and winfast navigator works wery well in sirf and nmea mode. try to do facktory reset with winfast.
hope it helps