Back up:

• mach_kernel (/)
• seatbelt.kext (/System/Library/Extensions)
• System.kext (/System/Library/Extensions)
• Audio/Video drivers

You can also turn off Automatic Update Downloading by going into:

System Prefs -> Software Update: Deselect the checkbox "Check for updates"

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My Specs
System: Custom Built
Mobo: ASRock Z68 Extreme4 Gen3
OS:Mac OS X MountainLion 10.8.2 & Windows 7 Ultimate x64
CPU: Intel Core i7 2600k @ 4.2GHz
Memory: 16GB DDR3 XMS3 1600MHz
Graphics Card: AMD Radeon HD 6870 1GB

Email/Gtalk:
[email protected]