Чего надо сделать для прекращения появления в журнале событий следующих 4-ёх сообщений:

This Machine is a PDC of the domain at the root of the forest. Configure to sync from External time source using the net command, 'net time /setsntp:<server name>'.


The device, \Device\Scsi\fastsx1, did not respond within the timeout period.


warning:
Because of repeated network problems, the time service has not been able to find a domain controller to synchronize with for a long time. To reduce network traffic, the time service will wait 960 minutes before trying again. No synchronization will take place during this interval, even if network connectivity is restored. Accumulated time errors may cause certain network operations to fail. To tell the time service that network connectivity has been restored and that it should resynchronize, execute "w32tm /s" from the command line.



Dynamic registration or deregistration of one or more DNS records failed because no DNS servers are available.

для чего используется служба времени?
Как ее отключить?