Dale is trying to upgrade to Windows 10, but his AVG antivirus software won't let him do it. He's tried to remove it but it still won't let him. Leo recommends going to the AVG website to download their removal/uninstaller tool. He shouldn't reinstall that either, as Windows already has its own antivirus called Windows Defender. If that doesn't work, he may have to back up his data, format the drive, and install Windows 10 from a clean hard drive.