I do not know how your child could install this software. Because it's not normaly for personal use and It is managed by McAfee ePolicy Orchestrator server. (McAfee ePO)
The response code you specify here must be generated by the ePO server that manage your DLP endpoint.
If it's true that it's your home computer, I suggest you contact McAfee directly or asked your kid where did he get the DLP client installation file? Or simply backup you PC and reinstall the OS.