Last Known Good Boot?
You didn't list that.
I have an Asus laptop running Vista with SP1. I allowed an update for .Net Framework and after I rebooted, my computer completes 95% of the installation then tells me it is "Shutting Down", then reboots, boots to the install, hangs, and reboots again in a never ending cycle.
I've tried safe mode, command prompt, and all of the other boot options and so far the only success I have is to change out the HD with one of my old ones. Everything works fine and I can access my newer drive using an external USB enclosure, but I cannot find for the life of me where to look on that drive to change it so windows doesn't try to do that update on startup.
Anyone have any ideas?