SQL Server 1068 and 1069

The sqlserver2000 on the machine has been useless for a long time, and the service has been stopped by me.
To enable the sqlserver service and service manager today, I did not expect that the 1068 error will be reported as soon as I start the service, and the 1069 error will be reported as soon as I start the service manager.
Think about how many things have been installed on my machine, so I tried to stop some other services and uninstall some of them.ProgramThe result is useless after a long time.
Final Solution:
The cause of the 1069 error is that I cannot log on. Maybe it is because I changed the system password.
Start "service" from "Administrative Tools", find "MSSQLServer" and "SQLServerAgent", right-click these two items, and open the "properties" panel, in "login", change "Login identity" to "Local SYSTEM account" to enable.