The game was working, but it lagged like my computer was struggling, so I searched for a solution and dgVodoo 2.55 seemed to be the one. It worked but I still had some performances issues, so as a last hope fix, I used my NVidia control panel and forced V-Sync and some other things, in case "it's better than dgVodoo graphical options and will stop my lag". (I was hopeless and exhausted yeah)
I tried again today, but now it just won't work at all. I tried everything, running the game vanilla without any nvidia or dgvodoo options, nvidia only, dgvodoo only, even by changing some settings in the GAME.INI, using compatibility, everything I could do. Nothing.
Either it's an Access Violation "insert random numbers or letters", or it's a Init3D Error, or just a complete crash.

I can always download the game again I know, but then I will have the poor performances again, and it's really frustrating.

Just in case, here's my PC:
NVIDIA GeForce GTX 960
AMD FX 8350 Eight Core Processor (4.0 Ghz)
16GB of memory
Windows 7 Professional 64bits
(I know my CPU is bad for solo core performances, but I don't think that"s the problem... at least I hope it's not, I already have enough troubles with it)

Any ideas/solutions? I really want to play this interesting game in good conditions.