Can you disable DHCP discovery in CIW on SBS2011?

Hi, am trialling SBS2011 in VM on the same wire as a production DHCP server. The CIW fails when it sees DHCP from what it says is a router (it’s not, it’s just detecting another Win32 DHCP box in the LAN)

I can’t disable DHCP in the production environment but need to run through this CIW in order to evaluate some features in SBS.

Was hoping someone might know a registry hack to trick the CIW into skipping the DHCP server discovery?

cheers in advance