[Shiraz (Ray)]

run the latest software you can find and note that the USB connection needs care. Also, you really need to recalibrate if you change temp, time or gain, so best to decide on a standard set of parameters and change sparingly. as a starting point, maybe you could consider:
gain = 70
offset = 20
temp maybe -15c (depends on your normal ambient)
USB3
USB setting 80
use the supplied cable direct to a USB port on the PC

Once you have it running OK, change stuff, but the above should get you going without too much pain - would be nice if others could chip in here if they have any other tips or can suggest better settings.

Also, use the fastest multi-core machine you can get your hands on for the processing.

the attached table should give you a reasonable starting point for broadband sub exposure length.