Below is snipped from %VCS_HOME%\log\SQL2008Wizard_A.txt log
2012/04/10 15:37:05 VCS INFO V-16-13-0 WIZ_CMDFAILED : PACSDB1 DisplayName_Desc_MACAddress_PrefixList Nic
DiscoveryManager.cpp:VDiscoveryManager::DiscoverValue_WizCmdClient[0988]
2012/04/10 15:37:06 VCS INFO V-16-13-0 WIZ_CMDFAILED : PACSDB1 DisplayName_Desc_MACAddress Nic
DiscoveryManager.cpp:VDiscoveryManager::DiscoverValue_WizCmdClient[0988]
The Wizard uses the following queries to determine NIC information (These can be run manually from a command prompt):
hadiscover -discover Nic DisplayName_Desc_MACAddress
hadiscover -discover Nic DisplayName_Desc_MACAddress_PrefixList
These queries can fail for certain NIC types / configuration. Running these manually may provide more details on the failure.