Something on your system is blocking the required port connections and auxiliary services/ helper programs. I'm sure Mr. Kopriva has some article on that on his blog and there's also some guidance on that somewhere buried in the AE and PPRo help files as wel las possibly a dedicated knowledge base article. Do a search...
Thank you for the link. After much effort we can't find any of the following, so haven't yet been able to fix the problem. We've done searches, been through everything as far as we can tell, but these files just don't seem to exist.
- Adobe QT32 Server.exe
If After Effects runs by itself, I promise you that AfterFX.exe is somewhere on your system.