Sometimes recently when I have removed AVG Free to replace it with MS Security Essentials (less overhead and not free for just personal use) I have run into problems with AVG’s uninstaller failing or stopping. If this happens and you go back to uninstall but the uninstaller fails to start, you need to go to AVG’s website and download their removal tool. As of today I only see 32 and 64-bit tools for 2012-2014 editions, but I think they work on older versions as well. Download and run the tool. It may reboot more than once, but after it is done AVG should be gone including the listing in COntrol Panel/Add Remove Programs or Programs and Features.