If this is due to your anti-virus, then I'd imagine that your anti-virus is one of these
AVG
Avast
BKav
Or if you're struggling to open the first EXE before the update when you join the server then it could also be
Avira
Adding an exception may fix the problem, running in compatability modes for windows xp may also help.
There was an EXE in the Ephinea download and thats the particular exe that you require.