The Change method modifies a service. The Win32_LoadOrderGroup parameter represents a grouping of system services defining ...

The Change method modifies a service. The Win32_LoadOrderGroup parameter represents a grouping of system services defining execution dependencies. The services must be initiated in the order specified by the Load Order Group as the services are dependent on each other. These dependent services require the presence of the antecedent services in order to function correctly. 
Note: In order to use the Change method to change a service from network service to local system, the StartName and StartPassword input parameters should be given the following values: 
startname = \"localsystem\"  
startpassword = \"\"	this is important, it needs to be an empty string, NOT null  
To change to network service:  
startname = \"NT AUTHORITY\
etworkService\" 
startpassword = \"\" 
The method returns one of the following integer values:
0 - The request was accepted.
1 - The request is not supported.
2 - The user did not have the necessary access.
3 - The service cannot be stopped because other services that are running are dependent on it.
4 - The requested control code is not valid, or it is unacceptable to the service.
5 - The requested control code cannot be sent to the service because the state of the service (Win32_BaseService:State) is equal to 0, 1, or 2.
6 - The service has not been started.
7 - The service did not respond to the start request in a timely fashion.
8 - Unknown failure when starting the service.
9 - The directory path to the service executable was not found.
10 - The service is already running.
11 - The database to add a new service is locked.
12 - A dependency for which this service relies on has been removed from the system.
13 - The service failed to find the service needed from a dependent service.
14 - The service has been disabled from the system.
15 - The service does not have the correct authentication to run on the system.
16 - This service is being removed from the system.
17 - There is no execution thread for the service.
18 - There are circular dependencies when starting the service.
19 - There is a service running under the same name.
20 - There are invalid characters in the name of the service.
21 - Invalid parameters have been passed to the service.
22 - The account, which this service is to run under is either invalid or lacks the permissions to run the service.
23 - The service exists in the database of services available from the system.
24 - The service is currently paused in the system.
Other - For integer values other than those listed above, refer to Win32 error code documentation.