Hi,
I had the same problem some months back - Avira Premium detected EigenD as a trojan all the time - a false positive.
To make sure that there is no real virus involved it might be a good idea to upload the EigenD version in question (only the reported file) to a site like
https://www.virustotal.com/
which checks it with almost all relevant virus scanners on the market and tells you the result. If only one (=your) scanner finds a virus the likelyhood for a false positive is very high.
What I did back then was to use the false positive report function of my virus scanner and added the specific EigenD file as an exception. The next EigenD version was detected as virus again though in most cases - unconvenient. At the end I switched anti virus software (am using the free one from Microsoft now).
All the best,
NothanUmber