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Look for the following log file:* C:\WINDOWS\ntbtlog.txt=== Last Known Good Configuration (your most recent settings that worked) ===Windows is started by using the most recently saved system configuration information. This option is good for situations where you experienced a startup problem after a Windows update or software install. This boot option will undo any changes that caused problems in the CurrentControlSet registry key, which defines hardware and driver settings. The Last Known Good Configuration feature replaces the contents of the CurrentControlSet registry key with a backup copy that was last used to successfully start up the operating system. If this option fails the first time you try it, the option is not necessary to try again. Each boot replaces the backup and therefore after a second attempt the backup will also be problematic.=== Debugging Mode ===Otherwise known as Windows Kernel Debugging mode, this mode loads limited drivers and software to facilitate troubleshooting the Windows Startup routine.