It always seems to get to the boot loading screen and sits there and a little box appears after a minute or two with a circle with a line through it, like something as gone wrong. Here's a screenshot of what I'm talking about.

I have had this problem booting through my PC and a virtual PC and I'm rreally wanting a Mac on my PC. Can anyone help me out??
System Specs:
Processor - AMD Athlon 64 X2 Dual Core Processor 3800+ 2.01 GHz
Ram - 2.00 GB
Graphics Card - NVIDIA GeForce 7600 GS
Sound Card - Realtek AC'97 Audio
Hard Drive - 320 GB (ST3320620AS ATA Device)
