Can I force Hackintosh Lion to use all 4 cores? I think it's only using 1 of my Cores. When I run Vlc Media player it struggles to run HD content at times.

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OS: Hackintosh Lion 10.7.3 and Windows 7
CPU: Amd Phenom II x4 965 3.4ghz
Ram: 4 gigs of ddr3 ram
Graphics Card: Nvidia GigaByte GTX 570
Motherboard: Asus M4A79XTD EVO