pop up on mac from AVG

I installed AVG antivirus then deleted it using the AVG website. I keep getting popups on my imac using Yosemite 10.10 stating Problem Report for Loader Agent. the popup persists even though the program has been deleted properly. the path to the file is: /Library/Application Support/AVG/*/LoaderAgent.app./Contents/MacOS/ AVG support has not been helpful to delete the popup.

Please advise.