No more system PTEs (NT4.0 with GForce)?

I get a blue screen crash by running an OpenGl app with NT4.0 and GForce board every once in a while since my OpenGL application seems to “eat” the PTEs (page table entries). This can be monitored with the NT performance monitor. I checked with simple OpenGL apps and they work ok. The MS Documentation kinda says that this occurs when a process is not cleaning up properly.

Could that be a driver problem? If not where should I look for (which system calls)? Has anyone experienced same problems?