First of all,
Source : http://www.infinitemac.com/f57/how-to-install-snow-leopard-on-a-pc-t3137/#post27953Snow Leopard 2 PC
This was tested with build 10A380 on a Core 2 Duo CPU. (see sig. for specs.) This is how I got it to work, it may not work for some.
What you will need:
1. A DMG of Snow Leopard.
2. At least 2 Partitions on the GUID partition table, or an external drive using GUID.
3. Download These.
4. A Drive/partition running OS X, and a blank partition/drive.
Extract SLStuff .zip and open "PCefi_v9_Installer_Final 2.dmg". Install the package.
In SLStuff, copy boot using terminal to the root of your WORKING, current OS X Drive (Presuming SLStuff folder is in the Downloads folder);
cp ~/Downloads/SLStuff/boot /
Mount your SnowLeopard.dmg and browse to /Mac OS X Install DVD/System/Installation/Packages and open OSInstall.mpkg. Install it onto your blank drive/partition. DO NOT RESTART AFTER INSTALL!
Install dsmos.kext and Disabler.kext into your Snow Leopard partition using OSx86 Tools, or a Terminal Command line.
Step 5 (Optional)
If you know your system cannot boot the Vanilla Kernel, Try out this kernel for snow leopard, by DmitriK. DOWNLOAD.
If you have a custom DSDT, I would recommend copying it and placing it in the root of your Snow Leo drive, just for stability and can even help when booting your system.
Reboot into Snow and see what happens!
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Worked for me, even though the CPU iNfo was wrong :/