Think i found the log in the Pather dir. here's what I found when searching for 'Error' and grabbing the first hit and some context:
2012-08-22 18:24:01, Error CSI
000002de@2012/8/22:23:24:01.646 (F) base\wcp\componentstore\com\advancedinstallerstore.cpp(565): Error HRESULT_FROM_WIN32(ERROR_ADVANCED_INSTALLER_FAILED) originated in function Windows::COM::CComponentStore::IAdvancedInstallerAwareStore_ResolvePendingTransactions expression: HRESULT_FROM_WIN32(14099L)
[gle=0x80004005]
2012-08-22 18:24:01, Info CBS Not able to add C:\WINDOWS\Logs\CBS\CBS.log to WER report. [HRESULT = 0x80070002 - ERROR_FILE_NOT_FOUND]
2012-08-22 18:24:01, Info CBS Could not get active session for current session file logging [HRESULT = 0x80004003 - E_POINTER]
2012-08-22 18:24:01, Info CBS Not able to add pending.xml.bad to Windows Error Report. [HRESULT = 0x80070002 - ERROR_FILE_NOT_FOUND]
2012-08-22 18:24:01, Info CBS Not able to add poqexec.log to Windows Error Report. [HRESULT = 0x80070002 - ERROR_FILE_NOT_FOUND]
2012-08-22 18:24:01, Error CSI 000002df (F) HRESULT_FROM_WIN32(ERROR_ADVANCED_INSTALLER_FAILED) #130# from Windows::COM::CComponentStore_IAdvancedInstallerAwareStore::ResolvePendingTransactions(dwFlags = (DontFailIfPrimitivesPending|IndicatePrimitiveRollback), Progress = NULL, Phase = 0, Disposition = (unknown enumerant 0)[3]" | "0)[gle=0x80073713]
2012-08-22 18:24:01, Error CBS Startup: Failed to process advanced operation queue, startupPhase: 0. [HRESULT = 0x80073713 - ERROR_ADVANCED_INSTALLER_FAILED]
2012-08-22 18:24:01, Info CBS SQM: Failed to read RptTime time value from registry. [HRESULT = 0x80070490 - ERROR_NOT_FOUND]
2012-08-22 18:24:01, Info CBS SQM: Failed to read RptCount count value from registry. [HRESULT = 0x80070490 - ERROR_NOT_FOUND]
2012-08-22 18:24:01, Info CBS Clearing HangDetect value
2012-08-22 18:24:01, Info CBS Saved last global progress. Current: 83, Limit: 83, ExecuteState: CbsExecuteStateResolvePending
2012-08-22 18:24:01, Info CBS Setting original failure status: 0x80073713, last forward execute state: CbsExecuteStateResolvePending
2012-08-22 18:24:01, Info CBS Startup: Processing complete. [HRESULT = 0x80073713 - ERROR_ADVANCED_INSTALLER_FAILED]
2012-08-22 18:24:01, Info CBS Restored system sleep block state: 0x80000003
2012-08-22 18:24:01, Info CBS Enabling LKG boot option
2012-08-22 18:24:01, Error [0x030149] CMI Callback_CBS_D
nlineInstall:Calling startup processing failed 0x80073713
2012-08-22 18:24:01, Info CMI CBS_Core_Finalize:Calling cbs core finalize
2012-08-22 18:24:02, Info CMI CBS_Core_Finalize:Calling cbs core finalize complete
2012-08-22 18:24:02, Error [0x030153] CMI Callback_CMI_ConfigInstall: CBS startup processing re-run failed.
2012-08-22 18:24:02, Info [0x0640ae] IBSLIB PublishMessage: Publishing message [Windows could not configure one or more system components. To install Windows, restart the computer and then restart the installation.]