I have a file I can't delete, ffmpeg.exe, and neither can AVG

Hi Nick,

We would like to know what happens exactly when you delete the file and how you identified the file as a threat.
If you receive any error/threat message, provide us the screenshot of the same to assist further.
You can post the screenshot here in your topic. Click on Answer & then click on the Image [mountain symbol] & follow the instructions.
How do I delete this, HKEY_CLASSES_ROOT\SOFTWARE\RealNetworks\Update\6.0\Preferences\Components\CodecPlusUpg:18.1\File21. 
Hi Nick,

We would like to know what happens exactly when you delete the file and how you identified the file as a threat.
If you receive any error/threat message, provide us the screenshot of the same to assist further.
You can post the screenshot here in your topic. Click on Answer & then click on the Image [mountain symbol] & follow the instructions.