Game randomly crashes, \BMRender

[dreamtrancer]

Hello, I just bought the atari version of king's bounty the legend and it's been either crashing to the desk top at randomly during gameplay with an error message saying .\BMRender\rmode.cpp(5423): Driectx call failed:-1,-1 code=0x88760870(-200553512) and another message on the bottom of my screen mentioning something about my display adapter nvlddmkm or it occasionally freezes during a battle screen and sometimes goes black but the music still runs and at that point i have to manually shut down my comp, even control,alt,delete doesn't end the process. Anyways, since then I've tried everything I could think of to make it work properly and to no avail. I've updated my drivers and direct x, I've rolled back to older ones, i shut off my antivirus software and I even disconnected from the internet to see if maybe windows updates were doing it, I even went to the in game settings and put them all the way down(even though my video card should be able to handle it). Now I'm at a loss.., I also patched it with 1.65 and put the mirabella mod on it as well and it still crashes randomly. Please get back to me as soon as possible so I can play and enjoy this game the way it was meant to be,=) Thank you, Brian

Here are my specs

Acer computer
WindowsVista Homepremium
Service pack 1
Processor: Intel(R) Pentium(R) Dual CPU E2200 @ 2.20 GHz 2.20 GHz
Memory (RAM) 4.00 GB
System type: 32-bit Operating system
Video card: Nvidia GeForce 8600 GTS
Direct X 10

P.S. I read on the forum that the game needs direct x 9.0c in order to run and I have direct x 10.., could that have something to do with it?and if so.., how would I be able to get rid of direct x 10 so that i can redownload 9.0c?

Thank you again for your time and I anxiously look forward to your reply!