install fail

please help!! at this for a while and have tried every variation (including what was advised here) here is the log. } May 7 16:41:23 sirmilesdaviss-Mac-Pro.local Installer[2291]: install:didFailWithError:Error Domain=PKInstallErrorDomain Code=112 "An error occurred while running scripts...

In the process of following the guide for installing 10.7; I downloaded 10.7 from the App Store. When installing on my MacBook, I received a flickering screen during restart and only half of the image showed on the screen. I let the install progress because the progress bar was still moving...