My airbag warning light is on all the time, is there any way I can reset it with a usb/obd cable and a shareware version of the rosstech software?

Is the light on, suggesting that the passenger side airbag has been disabled (say because a child seat was used?)

tbh: I wold rather get that airbag stuff checked properly, and I am pretty sure that you can't use vag-com to reset the light, although you might be able to scan the airbag controller for faults.