Well since you've not posted what version of KiXtart you're using or the VB script you mention I'm doing a lot of guessing here myself, but YES KiXtart can tell you this.

Using KiXtart v4.22 and ADSI you would query back the information you want.

.ADSPath (will give you full OU path)
.SamAccountName (will give you simple ID like NT 4)

I'm assuming you have the other portion of the mentioned script running. If you need further assitance please post the script of link to it and what version of KiXtart you're using and what client types you need to support and we should be able to help you further.