Issues upgrading guest additions 4.2.16 to 4.3.4 (Rev 91027)

[whatdoesitwant]

Windows 8 64 bit Guest on Windows 8 64 bit host.
Within the guest, the installation of guest additions (amd64) fails, running with administration rights:

Installing drivers ...
Output folder: C:\Program Files\Oracle\VirtualBox Guest Additions
Installing guest driver ...
Executing: "C:\Program Files\Oracle\VirtualBox Guest Additions\VBoxDrvInst.exe" driver install "C:\Program Files\Oracle\VirtualBox Guest Additions\VBoxGuest.inf" "C:\Program Files\Oracle\VirtualBox Guest Additions\install_drivers.log"
Installing driver ...
INF-File: C:\Program Files\Oracle\VirtualBox Guest Additions\VBoxGuest.inf
(1) ENTER: DriverPackageInstallW
(1) RETURN: DriverPackageInstallW (0x65B)
ERROR (0000065b): Functie is mislukt tijdens uitvoering.
Execution returned exit code: 2
Error excuting ""C:\Program Files\Oracle\VirtualBox Guest Additions\VBoxDrvInst.exe" driver install "C:\Program Files\Oracle\VirtualBox Guest Additions\VBoxGuest.inf" "C:\Program Files\Oracle\VirtualBox Guest Additions\install_drivers.log"" (exit code: 2) -- aborting installation
Error excuting ""C:\Program Files\Oracle\VirtualBox Guest Additions\VBoxDrvInst.exe" driver install "C:\Program Files\Oracle\VirtualBox Guest Additions\VBoxGuest.inf" "C:\Program Files\Oracle\VirtualBox Guest Additions\install_drivers.log"" (exit code: 2) -- aborting installation

I've attached the installation log file.

Readme in the 64 bit folder tells me to extract the drivers to guest C:\Drivers.
Has anybody seen this

[whatdoesitwant]

Deinstalling the old drivers does not seem to have an effect.

[whatdoesitwant]

The machine's log as required.

[whatdoesitwant]

Reverting the machine does not work.

[whatdoesitwant]

Starting the guest in safe mode does not work.
Allowing unsigned drivers does not work.

[lf2vbox]

Hello, I'm having the same problem.
win 8 guest, lin opensuse 11.4 LTS host, amd 64bit
A previous (4.0.20) version installed can't be removed.
The new version 4.3.4 installation ends in error.

(1) 0 - RETURN: DriverPackageInstallW (0x65B)

[gregoatorcl]

Upgrading Win8 Guest Additions 4.3.4 to 4.3.18 generates similar situation:

DriverPackageInstallW (0x65B)

Any updates on what is causing this?