I tried to install Alcohol 120% yesterday, even though I knew it didn't work. I made a system restore point just in case. During the installation, the OS BSODed. When I started it again, it complained that some Windows files were corrupt. Ooookay... how could an installation program do that?
I selected Last Known Good Configuration, but that didn't help at all. I did it several times, in fact, and it still complained about corrupt files. Meh.
I burned Vista RC1 to a new DVD-RW to prepare for reinstall later.
Today I booted up the computer and hey, it didn't complain about corrupt files and I hadn't done anything! But when I got into Windows, it gave me a BSOD. Fail safe mode, the same. BSOD. I select Last Known Good Configuration. Still BSOD.
So, I put in the Vista DVD and booted from it. I selected repair and then Fix Start up and lastly System Restore to the restore point before I installed Alcohol 120%. And now... it works!
That just goes to say - never trust Last Known Good Configuration! The installation program did a better job at fixing the computer than that stupid alternative.