Windows 7: SP1 Configuration Failure - Error 8004402f

Hi,

I am having quite a bit of difficulty installing Windows 7 SP1 64bit onto a client PC. The system config is as follows:

Mainboard - Asus P6x58D-E
Processor - Intel Core i7 Extreme 990x
Memory - 12gb DDR3 10666
HDD - Crucial C300 SSD 256 - Boot drive
HDD - 2 x WD2002FYPS 2TB storage drives
Graphics - 2 x ATI 5900 Series in CrossFire

All mainboard and video drivers are up-to-date, including the BIOS.

Each time I try the installation, it fails with the above message. The SP seems to get all the way through to the configuring updates part, gets to 99% and then fails.

Here is what I have tried:

Run the System Update Readiness Tool - No difference
Run SFC /Scannow (as administrator) - No problems found, no difference
Tried re-naming the Software Distribution folder - no difference
Changed the temp file locations to c:\Windows\Temp and then to one of the storage drives - no difference
Tried disabling CrossFire -
Tried running it after a clean boot (disabling all services barring the MS ones - no difference
Tried doing this via Windows Update and downloading and running the full file itself - same error every time

The only thing I haven't tried as yet is updating the firmware of the SSD - unfortunately, it will delete all of the data on the drive updating the firmware from it's current level, hence why i've not attempted this yet.

Does anyone have any other ideas as to what could be causing this or any other suggestions for trying to get this installed?

Thanks

Paul