Why does it have to be so painful...

I am trying to upgrade form business to ultimate. After30 minutes of doing
stuff (which is supposed to only "unlock features"). I get the following in
the setuplog:

2007-10-06 10:46:32, Error [0x06420c] IBSLIB ReadOrWriteSectorsWinNt:
Couldn't set file pointer to 0x0[gle=0x00000003]
2007-10-06 10:46:32, Error [0x06420b] IBSLIB ReadOrWriteSectors: Failed
to read sectors (start sector = 0xI64x, sector count = 0x0, sector size = 0x0)
2007-10-06 10:46:32, Error [0x0641ff] IBSLIB
CheckSysPartAndReadBootCode: Error reading NTFS boot sectors!
2007-10-06 10:46:32, Error [0x064133] IBSLIB SaveBootSector:
CheckSysPartAndReadBootCode failed to get boot sector.
2007-10-06 10:48:11, Error [0x06420c] IBSLIB ReadOrWriteSectorsWinNt:
Couldn't set file pointer to 0x0[gle=0x00000003]
2007-10-06 10:48:11, Error [0x06420b] IBSLIB ReadOrWriteSectors: Failed
to read sectors (start sector = 0xI64x, sector count = 0x0, sector size = 0x0)
2007-10-06 10:48:11, Error [0x0641ff] IBSLIB
CheckSysPartAndReadBootCode: Error reading NTFS boot sectors!
2007-10-06 10:48:11, Error [0x06411c] IBSLIB UpdateBootCode:
CheckSysPartAndReadBootCode failed!
2007-10-06 10:48:11, Error [0x06063d] IBS
PrepareSystemToBootWindows: Failed to update boot code for system volume
2007-10-06 10:48:11, Error [0x060223] IBS Callback_UpdateBootCode:
Unable to prepare drive to boot Windows.
2007-10-06 10:48:11, Error [0x060616] IBS Callback_UpdateBootCode:An
error occurred while updating the boot code. GLE = 0.

Tried it several time, tried inspecting the disk (with fix errors)...no
change.

Help please!