Hi,
It can be quite frustrating to program using the DAQmxBase driver. Beaware, that this is just a temporary driver. The next release of the DAQmx driver will include the usb-600x series.
When this is said, you should be able to use the driver. To make sure that the device is working use one of the examples found by pressing the windows start button > Programs > National Instruments > DAQmxBase > Examples > LabVIEW.
The examples will give you a good starting point.
Also I would make sure that I had the newest version of the driver installed. Following link will provide that for you:
http://digital.ni.com/softlib.nsf/webcategories/85256410006C055586256BBB002C128D?opendocument&node=132060_US
Let me know if this doesnt solve your problem.
Regards
Anders M
NI DK