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ERROR_ALREADY_RUNNING_LKG
Windows is already running the LastKnownGood control set
The SCM service database is registry-backed, and Windows can preserve a LastKnownGood copy of the service configuration after a successful boot. During recovery, the system can boot using the control set identified by the LastKnownGood selection. This status means the fallback configuration is already active.
Do not request another fallback as though Windows were still using the failed control set. Investigate why the normal service configuration failed and compare current service/driver settings with the control set that triggered recovery. An auto-start service configured with critical error control can cause the SCM to reboot using LastKnownGood; if LastKnownGood is already in use and the critical startup path still fails, the boot cannot simply fall back again. Preserve boot and System event logs before changing service start configuration.
What to inspect
- Confirm the active and LastKnownGood control-set selection before recovery actions.
- Identify critical auto-start service or driver failures from the failed boot.
- Preserve boot/service logs before modifying the recovered configuration.
References
- Microsoft: Automatically Starting Services
- Microsoft: Database of Installed Services
- Microsoft: NotifyBootConfigStatus
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