Don't try just "using" the kexts, try integrating your Dev. ID into them, and your NVCAP setting.

If you are still using the 10.5.2 Leo kexts, DiaboliK's plister can do that for you.

http://diabolik1605.com/plister/

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My Specs
System: Custom Built
Mobo: ASRock Z68 Extreme4 Gen3
OS:Mac OS X MountainLion 10.8.2 & Windows 7 Ultimate x64
CPU: Intel Core i7 2600k @ 4.2GHz
Memory: 16GB DDR3 XMS3 1600MHz
Graphics Card: AMD Radeon HD 6870 1GB

Email/Gtalk:
[email protected]