Right now it's reinstalling, but this time, I used the Partition tab in Disk Utility to format the drive, and used the GUID format. Hopefully it works this time.

Are you really using zephyroth's image? Or when do you install EFI v8? I never had this option on zephyroth's image, only languages (French only) and Nvidia drivers. I got mine searching for 'AMD Leopard' in the bay, it's the image from 11-26-2007. There is also an RC2 image from ToH in the bay, but this isn't even booting on our nForce4 systems.

I'm still using my 3-partition system, installing first Tiger, then Leopard, fix from the Tiger system the Leopard problems (deleting GeForce.kexts and NVidia.kexts on my ATI system), making the Leo partition bootable, plug in keyboard and mouse into USB and finish the Leopard installation. This method was always working for me. Seems a bit complicated, but works every time. You have a smaller harddisk, so I would recommend only 2 partitions, about 12GB for the 2nd partition (which is used for test and recovery purposes), the rest for the main partition. And check if you have the correct image.

Finally managed to get it to work by running Repair Permissions from the DVD after installation and re-installing the EFI files :)

Now I just need to get Ethernet, Graphics and Sound to work lol

And I'm 99% sure I'm using the Zephyroth image. I didn't download it from a torrent site, instead I used a warez forum and Rapidshare.com

what for options do you have on the DVD, in the customized installation. Zephyroth's image has the Additional Fonts, French language, Gutenprint printer drivers, X11 and nVidia drivers.

Yes, they're the options I have. When I installed I had the printer drivers and X11 checked, the rest unchecked.

The nVidea ones were labelled for the 8800, although I've been reading that they work for my 8400 aswell. Can I install these drivers without reinstalling? Would "Zephyroth NVidia Universal Installer" work? Thanks.

Install the Nvidia Universall Installer.

It worked :) Now I just need to get the Audio and LAN drivers...

Sorry for all these questions, but does anyone know why in Leopard, I can see the 'Storage' partition from my other drive, but not the Vista one? (Both of them are formatted to NTFS).

Open the Disk Utility (in Applications/Utilities) and search on the left side for your Vista drive. If its grey, select it and use the 'activate' button in the top button list. Then the drive should be shown. Tip: put a dot '.' before the drive names of the Windows drives, like '.Vista' So these drives aren't shown on the Mac desktop, but you still can access them on the left side of a finder window.

Thats the thing, it doesn't show in the Disk Utility either, and Leopard seems to think that hard drive is 128gb as it can't see the Vista partition.

See: http://img145.imageshack.us/img145/9597/picture1uu9.png
That Maxtor drive is supposed to be around 200gb and show the Vista partition. (and I know the partition exists, because I can still boot to it).

UPDATE: I got the audio drivers working :) For anyone looking for them (ALC883), heres the installer I used: http://forum.insanelymac.com/index.php?showtopic=36520. And it seems as though there isn't any LAN drivers for mine, so I'm going to try with a PCI card.

Whoops. Have you checked the settings in the BIOS? Ist the HD set to LBA, Large or Auto? Some HDs have some kinds of size limiting jumpers, often 40 or 136 GB, this would explain the 128 GB size. Maybe Vista cares not about this, OS's are working different. I have an NEC DVD-RW drive in my computer which is not recognized in BIOS, but in MacOS I can use it without problems and can even burn DVDs with it. That's also a feature whats not so easy to explain.