With a number of users having issues with the new EAC update, there have been many separate threads and posts made on the topic. This thread is for users to post on any EAC related bugs, and to collect all the feedback in one thread instead of a 100 different ones which tend to clutter up the forum.
The Devs will be primarily looking at this megathread and as such it would be best if you refrain from making other EAC bug posts and detail your issues here instead.
Some useful links where you can find troubleshooting information-
Error: Start Service Failed
For this one see http://faq.easyanticheat.net/content/6/4/en/error-start-service-failed.html
People have also reported https://www.malwarebytes.org/antirootkit/ to be useful