Hi guys!!
naquaada my specs:

Processor: AMD Athlon 64 3200+
Codename: Venice
Instructions: MMX, 3D Now!, SSE, SSE2, SSE3, x86-64

Motherboard:
Manufacturer: MSI
Model: AMETHYST-M
Chipset: ATI Xpress 200
Sound card: Realtek AC'97 Audio
RAM: 512 MB
HDD: SAMSUNG SP 1604N/R ATA

I have installed Windows Vista Premium

please help me i would like to install MAC OS on my pc