Audio Device not loading in vista!

> Hi can someone please help me! I am having serious problems!
>
> I have recently installed Windows Vista Ultimate and have been unable to
> get
> sound devices to load. I am getting an error:
>
> Windows cannot load the device driver for this hardware. The driver may be
> corrupted or missing. (Code 39)
>
> When I look at details for the drivers both devices give problem code 27
>
> Currently I have a Sound Blaster Xfi Extreme Audio sound card and also an
> inbuilt AC 97 Intel chip. The intel is on a d845ebg2 board, it comes up as
> Intel 82801DB/DB01 AC '97 Audio Controller (I have tried using drivers for
> the other Intel on board cards). I have also tried my old Sound Blaster
> Audigy card and tried a Sound Blaster Audigy LE card which I took back.
>
> For all these devices I have tried them on their own and in different PCI
> slots (i.e. with onboard audio turned off in the BIOS or the pci card
> taken
> out). I have tried the latest drivers from Creative or Windows Update. I
> have
> correctly matched my Creative products from the label on the board to the
> drivers on the website.
>
> I know these devices work because they work in XP on my other boot.
>
> I have tried at the boot screen pressing F8 and using unsigned drivers.
>
> I have tried typing Bcdedit.exe –set nointegritychecks ON at the command
> prompt with admin privaliges.
>
> I have tried using regedit and removing upperlimits and lowerlimits. I
> have
> no idea what this even means.
>
> In short I do not know what to do! Please help me I want to watch Heroes!