You really should post your actual specs on the forum and placing them in your signature would be even better. It is much easier for you you do it once then all of us to have to look it up each time we want to help.

Did you download the update from Apple's website or are you using the Software Update? If you have downloaded the update from the site and have backed up both of those files. You should be able to update following these directions. http://netkas.org/?p=50

If for some reason you are unable to boot. Use the boot-options:
When you start the computer up you see the Darwin Boot screen it will count down and by pressing the key indicated it will allow you to enter these options.

If this doesnt work post back with the last line it hangs on. You have backup copies which we can use under Single User Mode (Command Line) in case of emergency.

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MOBO: Z77MX-QUO-AOS CPU: Core i7 3770K GPU: MSI N760 TF 2GD5/OC Case: Modded MacPro2,1
Memory: 32GB Corsair Vengeance (CMY32GX3M4A1600C9) Wifi: Airport Extreme bcm94321MCA BIOS: HermitCrab Labs H3A.816M
Monitor: AOC Q2963Pm 29" WFHD 2560x1080 21:9
Interests: KDE on Apple Darwin, Keeping it real with the command line, Helping those that help themselves