I Try to update Windows Vista SP1 towards Windows Vista SP2 (KB948465).
The installation ends with error 0x80004005. I also tried already a "Clean install", same error happens.
The following article explains the reason: http://support.microsoft.com/kb/971204
Cause: When you install Vista SP2, the Vista SP2 installer must update the system boot files. If third-party disk management tools are used to "clone" disks or partitions, the SP2 installer will be unable to uniquely identify the correct system boot files.
Resolution: To work around this issue, turn off the computer and physically unplug all drives that are not required for starting Windows. Power up the computer and restart the service pack installation.
If the workaround is not successful, the alternative is to perform a clean-install.

I run a seperate system partition and start partition (see in the following article)
http://support.microsoft.com/kb/314470

I changed the configuration and unpuged all disks exept the systemdisk.
The systemdisk contains:
- one system partition. (512 MB FAT32).
- Some free space
- One Start partition (NTFS) containing Windows Vista Ultimate SP1.
Then I startet the Update process für Vista SP2.
It worked simular to the last tries finishing step 3/3 with 100% percent. After some additional minutes, it startet to undo the changes.
Error code 0X80004005
To be very sure, additionally I pepared "Clean install".
Then I startet the Update process für Vista SP2 again.
It worked simular to the last tries finishing step 3/3 with 100% percent. After some additional minutes, it startet to undo the changes.
Error code 0X80004005

Has somebody any idea?

Best regards Josef

SP2 seems don't like your hdd
I found in your log this:

Process output: [l:109 [109]"BFSVC: GetFileAttributes(\\?\GLOBALROOT\Device\HarddiskVolume1\Boot\BOOTSTAT.DAT) failed! Last Error = 0x2.


Process output: [l:109 [109]"BFSVC: GetFileAttributes(\\?\GLOBALROOT\Device\HarddiskVolume1\Boot\BOOTSTAT.DAT) failed! Last Error = 0x2.

My solution:Reset the whole MBR disk (it is stronger than formatting partitions).Of course if you'll do you lose all data on hdd.
To do that I recommend this tool DIY DataRecovery MBRtool, backup/restore/edit the MBR (freeware)
(not each tool do that perfect)