First download the 10.6.8 kernel from nawcom's, its available on kexts.com or http://3rr0rists.net/driver/legacy-k...by-nawcom.html as actually nawcom's blog is down.
Find the AppleACPIPlatform.kext and IOPCIFamily.kext from the 10.6.7 update,
try to Google it.
Download: pfix http://www.osx86.net/view/593-pfix_3.1.html
Run the update, when finished don't restart. Replace the 2 downloaded kexts in System/Library/Extensions. Create an account password. Run the pfix and choose the root volume, usually: disk0s1 to fix permissions.
Force Quit the update intaller.
Run the nawcoms 10.6.8 kernel and restart.