Only thing that springs to mind right away is the UIPC version. But you recently re-downloaded all that from Pete Dowson's page
http://www.schiratti.com/dowson.htmlGoing there, I noticed that there is a September 9th 2013 version out nowadays (I'm sure I don't have that one

)
I do know that earlier versions stopped working because of a certificate issue, and everybody had to upgrade (that was about two years ago)
EDIT
You cleared your PC from IVAO software
AND FSUIPC, you say. The picture is from the final stage of IvAp installation; that leads me to believe that IvAp carries FSUIPC inside it's own installation. That is most probably a too old version, then. One with the certificate issue...
First install (a recent copy of) FSUIPC, and IvAp only thereafter. Hopefully, IvAp installer will recognise the installed FSUIPC as being newer, so that it does not need to install FSUIPC