Try moving your 10.x.x.x network to a higher Binding level in the adapters list:
- Click Start, click Run, type ncpa.cpl , and then click OK.
- On the Menu list, select Advanced -> Advanced Settings.
- Highlight your 10.x.x.x network in both panes and move them higher that the 192.x.x.x NIC.
- Restart DHCP and see what it picks up.