Anyone else having problems installing Elements..

I am trying to install Photoshop Elements, but keep getting the same message:

'Please close the following applications before continuing - ElementsAutoAnalyzer, PhotoshopServer and dynamiclinkmamager.'

As far as I can see, I have nothing else open, have ejected the disk, disconnected from the internet. I don't have anything on my computer with those application names.. What is going on! (Am I being blonde?)

Thanks!