Installed Vista Premium on Virtual PC. Modded termsrv.dll and imported the registry keys above. Still wasn't able to RDP since the service wasn't listening on port 3389. Added the following keys and was able to RDP into Vista Premium.
Great work everyone!
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp]
"Callback"=dword:00000000
"CallbackNumber"=""
"CdClass"=dword:00000000
"CdDLL"=""
"CdFlag"=dword:00000000
"CdName"=""
"CfgDll"="RDPCFGEX.DLL"
"ColorDepth"=dword:00000005
"Comment"=""
"Domain"=""
"DrawGdiplusSupportLevel"=dword:00000001
"fAutoClientDrives"=dword:00000001
"fAutoClientLpts"=dword:00000001
"fDisableCam"=dword:00000000
"fDisableCcm"=dword:00000000
"fDisableCdm"=dword:00000000
"fDisableClip"=dword:00000000
"fDisableCpm"=dword:00000000
"fDisableEncryption"=dword:00000001
"fDisableExe"=dword:00000000
"fDisableLPT"=dword:00000000
"fEnableWinStation"=dword:00000001
"fForceClientLptDef"=dword:00000001
"fHomeDirectoryMapRoot"=dword:00000000
"fInheritAutoClient"=dword:00000001
"fInheritAutoLogon"=dword:00000001
"fInheritCallback"=dword:00000000
"fInheritCallbackNumber"=dword:00000001
"fInheritColorDepth"=dword:00000000
"fInheritInitialProgram"=dword:00000001
"fInheritMaxDisconnectionTime"=dword:00000001
"fInheritMaxIdleTime"=dword:00000001
"fInheritMaxSessionTime"=dword:00000001
"fInheritReconnectSame"=dword:00000001
"fInheritResetBroken"=dword:00000001
"fInheritSecurity"=dword:00000000
"fInheritShadow"=dword:00000001
"fLogonDisabled"=dword:00000000
"fPromptForPassword"=dword:00000000
"fReconnectSame"=dword:00000000
"fResetBroken"=dword:00000000
"fUseDefaultGina"=dword:00000000
"InitialProgram"=""
"InputBufferLength"=dword:00000800
"InteractiveDelay"=dword:00000032
"KeepAliveTimeout"=dword:00000000
"KeyboardLayout"=dword:00000000
"LanAdapter"=dword:00000000
"MaxConnectionTime"=dword:00000000
"MaxDisconnectionTime"=dword:00000000
"MaxIdleTime"=dword:00000000
"MaxInstanceCount"=dword:ffffffff
"MinEncryptionLevel"=dword:00000002
"NWLogonServer"=""
"OutBufCount"=dword:00000006
"OutBufDelay"=dword:00000064
"OutBufLength"=dword:00000212
"Password"=""
"PdClass"=dword:00000002
"PdClass1"=dword:0000000b
"PdDLL"="tdtcp"
"PdDLL1"="tssecsrv"
"PdFlag"=dword:0000004e
"PdFlag1"=dword:00000000
"PdName"="tcp"
"PdName1"="tssecsrv"
"PortNumber"=dword:00000d3d
"SecurityLayer"=dword:00000001
"Shadow"=dword:00000001
"UserAuthentication"=dword:00000000
"Username"=""
"WdDLL"="rdpwd"
"WdFlag"=dword:00000036
"WdName"="Microsoft RDP 6.0"
"WdPrefix"="RDP"
"WFProfilePath"=""
"WorkDirectory"=""
"WsxDLL"="rdpwsx"
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Terminal Server\Wds\rdpwd\Tds\tcp]
"InteractiveDelay"=dword:0000000a
"OutBufCount"=dword:00000006
"OutBufDelay"=dword:00000064
"OutBufLength"=dword:00000212
"PdClass"=dword:00000002
"PdDLL"="tdtcp"
"PdFlag"=dword:0000004e
"PdName"="tcp"
"PortNumber"=dword:00000d3d
"ServiceName"="tcpip"