Open regedit…..
Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Reliability
You can safely delete all the values mentioned, for example, my system has the following values, DirtyShutdown, DirtyShutdownTime, LastAliveStamp, TimeStampInterval, LastComputerName
They will be recreated as needed. You can make a backup of the registry entry if you want.