Unauthorized access blocked ( Send Terminate Message to Window )

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I have an alert like this:

 

Severity : Medium

 

Activity : Unauthorized access blocked ( Send Terminate Message to Window )

 

Status : Blocked

 

Actor : c:/windows/explorer.exe

 

Actor PID : 1820

 

Target :  C:/Program Files/Norton 360/Engine/3.5.2.11/HSLoader.exe

 

Target PID : 2688

 

Action : Send Terminate Message to Window

 

Reaction : Unauthorized access blocked

 

 

Could someone tell me what's going on and how could I fix it.

 

Thanks