SymptomsParallels Panel installation does not allow to use Windows safe mode. It looks like a system reboot in 30 seconds after booting Windows in safe mode if Panel services are enabled.
CauseThe reason of such behavior may be in settings of the Plesk Management Service - its ErrorControl parameter. If a value of the parameter equals 3, then service failures will cause system restarts.
ResolutionIt is possible to fix the issue by the following method: set the ErrorControl value of the service to 1 or 0 instead 3.
In the Windows registry the following item should be edited:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\plesksrv - then the ErrorControl parameter value.