|Kinda surprised to read you have SBS and does not appear you are using its dhcp service which can also be configured to update DNS. I get this from the fact you say the server [DNS] sees the pc at x.x.x.15 though wins and the pc say x.x.x.8. Wins got updated but dns apparently did not.|
You didn't tell us how the 192.x.x.x network is getting its ip.
It appears the moved pc is requesting and getting a ip from the 10.x.x.x subnet
In Active Directory /sites and services do you have the 10.x.x.x network listed? You should as a subnet so AD knows about it.
Are you doing ip reservations [mac address filtering] ? If yes this would explain why the moved pc got the ip it did. Otherwise you need to tell us a bit more about how you are handling dns and ip assignments