Updating Anti-Virus

Graham, Have a look @ this recently released AVG article (http://avgclick.me/InstallIsRunning).
AVG Guru

I have AVG Zen.  The programme tells me I need to update my anti-virus.  When I try to do this I get a pop-up telling me I have a running installation and to update once this is finished.  As far as I know I have no installation running!  Any ideas?

Graham, Have a look @ this recently released AVG article (http://avgclick.me/InstallIsRunning).
AVG Guru