I'd like to know if I need to install Leopard first on my machine, or how to install the current Snow Leopard and what to download? Nothing I have gotten works, and all of these tutorials online are just starting to irritate me.

Here's my specs:

System Information
Time of this report: 12/30/2010, 14:01:22
Machine name: PHAROPHEX-PC
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7600) (7600.win7_gdr.100618-1621)
Language: English (Regional Setting: English)
System Model: MS-7576 (790GX-G85) Chipset AMD SouthBridge, ATI
BIOS: Default System BIOS
Processor: AMD Phenom(tm) II X4 805 Processor (4 CPUs), ~2.5GHz
Memory: 8192MB RAM
Available OS Memory: 8192MB RAM DDR3
Page File: 1641MB used, 14739MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7600.16385 64bit Unicode

Display Devices
Card name: ATI Radeon HD 4800 Series
Manufacturer: ATI Technologies Inc.
Chip type: ATI display adapter (0x9442)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_9442&SUBSYS_E1041092&REV_00
Display Memory: 4081 MB
Dedicated Memory: 1014 MB
Shared Memory: 3067 MB