you need to find out how that property (ANTIVIRUS ) is being popuplated. it's likely that a script is running to populate that. so you would need to create a new property and write another script to set the value you want, based on some evaluation in your script of the registry key.
to get this into reports, check the 'used in reports' option in the property and run the etl.
you can then create a new ad-hoc report and choose all the server properties you want to show in the report.