Can't upgrade Win 7 Pro/64 to Win 8 Pro - setup can't continue

Question

Hi,
When I try upgrade Win7/64 to Win 8, after "Collecting files, Settings and Applications (100%)" , error message says "setup can't continue".
The setuperr.log says basically "Failed to backup BCD database". So I have reinstalled Win 7 (over the current installation, so all basically remains the same, updated ALL, made
Clean Boot as described at http://support.microsoft.com/kb/929135 (loaded just system services and stopped ALL other services), but the error log remains EXACTLY the same:
2012-11-01 11:27:07, Error      [0x0808fe] MIG    Plugin {ee036dc0-f9b7-4d2d-bb94-3dd3102c5804}: BRIDGEMIG: CBrgUnattend::CollectBridgeSettings failed: 0x1, 0
2012-11-01 11:32:51, Error      [0x064186] IBSLIB CSystemVolumeSelectionCheckpoint: Failed to backup BCD database from "C:\Boot\BCD" to "C:\$WINDOWS.~BT\Sources\Rollback\Boot\BCD".[gle=0x00000006]
2012-11-01 11:32:51, Error      [0x064199] IBSLIB SetCheckpoint(StartPhaseSystemVolumeSelectedCheckpoint): threw exception.: class RollbackException: RollbackException: Error(6), CSystemVolumeSelectionCheckpoint: Failed to backup BCD
database. void __cdecl OSRollbackService::CSystemVolumeSelectionCheckpoint::Finalize(const unsigned short *,struct OSRollbackService::ICheckpointParameters *)
2012-11-01 11:32:51, Error      [0x06418a] IBSLIB RollbackSetCheckpoint(StartPhaseSystemVolumeSelectedCheckpoint): threw exception.: class RollbackException: RollbackException: Error(6), CSystemVolumeSelectionCheckpoint: Failed to backup
BCD database. void __cdecl OSRollbackService::CCheckpointImpressario::SetCheckpoint(const unsigned short *,struct OSRollbackService::ICheckpointParameters *)
void __cdecl OSRollbackService::CSystemVolumeSelectionCheckpoint::Finalize(const unsigned short *,struct OSRollbackService::ICheckpointParameters *)
2012-11-01 11:32:51, Error      [0x06414e] IBSLIB RollbackSetCheckpoint(StartPhaseSystemVolumeSelectedCheckpoint) failed. Disabling Rollback.
2012-11-01 11:32:51, Error                 MIG    Callback_Rollback_DownlevelCheckpoint: Failed to set checkpoint StartPhaseSystemVolumeSelectedCheckpoint
What can I do more?

Answer 1

Happened to me, too.
I realized that on my Windows 7, "bcdedit /export" resulted in the same error ("The handle is invalid." == ERROR_INVALID_HANDLE == 0x00000006). Apparently the problem is not in Windows 8 but in the running Windows 7.
So I followed the procedure here:
http://support.microsoft.com/kb/927392/en-us which is renaming the old BCD and peforming "bootrec /RebuildBcd". (Note: Without renaming the original BCD, "/RebuildBcd" did nothing effective.)
After that, "bcdedit /export" started to work. Upgrading to Windows 8 also went through.
Thanks Bolean for the hint.