Need for Speed Porsche Unleashed is one of the finest automotive games of all time.
Sadly, I too am facing the same problem with the same error
DX7_createzbuffer, CreateSurface failure! DX7 Error Code: DDERR_INVALIDPARAMS (80070057) File \3rash\dx7\dx7dev.c, LINE 1070 [File=9null0, LINE=0] when I installed it on my new Asus G74SX laptop (Intel i7-2670QM, 16GB RAM, NVIDIA GeForce GTX 560M with 3GB GDDR5 VRAM, Windows 7 Home Premium - 64bit, DirectX 11)
I would like to request any readers or tech gurus to please give me some kind of solution either by way of settings, a patch or some updated drivers created specially for this classy game which is in a league of its own.
It runs perfectly well on my old Compaq Presario 7000 desktop (Intel PIII 1GHz, 256MB RAM and NVIDIA GeFORCE 5000 series PCI card).
It's unfortunate that these really advanced graphic cards and operating systems are not compatible to playing these older games like NFS 5 - Porsche Unleashed, Delta Force-Task Force Dagger and AOE to name a couple.
Please help.