Hi guys, this is my first post, but I've been looking in here for quite a while and I'm posting cause I've never come across this problem before in other topics. I've googled it with no success too.
Okay, I have a Dell Dimension 5100. It used to have a Radeon X300/X550 Hypermemory on it, and I used to be able to play FFVII fine on it, no problems. I installed a variety of patches, and there were still no problems.
I was given a 7900GS by a friend just a month ago, and I wanted to continue playing FFVII, but for some reason it doesn't work anymore. By that, I mean the screen stays black right from the start, then it crashes. I can hear the music begin and everything, but it just crashes. And theres nothing to suggest there are problems other than my 7900GS.
I've reinstalled FFVII, even the outdated movie player and directX5! Ive changed all the settings in FFConfig, and even tryed to play it without the 1.02 patch in software mode. For some reason, Even the software mode no longer works.

I've twiddled around with settings in NVidia control panel, and nothing gets it working.
The only other thing that I've done is disable my onboard soundcard, because I bought a Creative X-fi Xtreme Audio, and thats the only other thing thats changed. I'm mentioning this, because if even software mode doesnt work, then maybe its not a graphics card problem? I really dont know! But the audio should work fine, because in FFConfig, the Tests work fine. So I think it must be Graphics card related.
Could someone please enlighten me on this?
Thanks
EDIT: I've now tried the supposed "fix" which is that I should download Rivatuner and turn off 8-bit palletted textures, which I did, but it didn't fix my problem either.