Its working, its working
Right, first off I must admit an error on my part regarding the driver version numbers.
The first one (from the Audigy disk) is 1.80.00
The first web update is 1.84.11
The second web update is 1.84.40
Theres also a downloadable update that used to be in the auto update with the version number 1.84.50. This is what I used to only be able to update to.
The latest driver is 1.84.55 and incorporates the new EAX4 instructions for Doom 3, which is what I wanted it for.
Now, to cut a long story long, Creative got back to me after they finally realised what OS I was running even though I filled that box in during the web question thing! It turns out that this driver on my card requires a manual install. This is done via the decompressing of the 1.84.55 driver file, which can be downloaded separately or found in your 'Creative\Updates' folder if, like me, you have a failed installation. I will paste this verbatim:
"Open up the installation file with winzip, extract all the components
out into one folder. try to find for a ctzapp.exe. Make sure it is the
file in all caps and that has an icon of a blue and red or orange
triangle. Double click on this file.
When the Creative Driver Update Utility comes up, choose Driver
Installation and WDM and hit OK. It will now reinstall only the drivers
for the sound card. Again, when it is done, it will ask to restart the
computer, which you will want to do."
So, there you go MAllen, you were spot on regarding the implementation of my version of the Audigy 2. For the record, I used WinRAR if anyone is interested. Also, the file in my extracted directory was CTZAPXX.EXE instead of the one mentioned above.
[EDIT] Another thing, at least its not an issue with the MSI board.
