Mac OS X or other Mac OS on Toshiba

I have a
Toshiba manufactured
Model- Qosmio X305
Processor- Intel(R) Core(TM)2 Duo CPU P7350 @ 2.00GHz 2.00 GHz
Memory (RAM)- 4.00 GB
System Type- 64-bit Operating System.

Windows Edition- Windows Vista Home Premium
Copyright 2007 Macrosoft Corporation.
Sevice Pack 2
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I would like to make this run a Mac OS instead of a Windows.
Is there a way?
And can someone give me like a download of the OS or something.
Please & Thanks.