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mcscrpt_inuse is invoked as part of the scripting engine of the McAfee Agent. It is basically called when the agent is running a task, such as an update for example.
As tasks are generally scheduled, this process will often run in the system context.
However an update task may need to carry additional credentials to allow access to a network or internet resource (perhaps a distributed repository or source site). The system account won't have network access if my sketchy Windows skills recall correctly Hence the additional account info.
So you may be seeing a failed update task, which would be reflected in the local mcscript.log in more detail with any luck.