The new iATKOSv7 should be compatible with your motherboard. If you need additional information on the release, their forums can be located at http://www.uphuck.com

Most likely, you'll have to boot the installer with the cpus=1 kernel flag.

Good luck.

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Mac OS X Leopard 10.5.7 (Retail)
Motherboard: MSI P6N Diamond
Processor: Intel Core 2 Quad Q6600 2.4GHz
Video Card: MSI NX 6600 TD256E (CI QE Dual Displays)
Memory: Corsair TWIN2X4096-6400C5DHX 4GB DDR2