EasyBCD is a passive utility for managing the contents of the MS BCD.
Installing it does nothing more than occupy a small space on your HDD.
It does absolutely nothing to your system just by being there.
It's only when you run it and use it to make additions/changes/deletions to the BCD contents that it would be capable of affecting the bootability of the PC
Like regedit, it will do exactly what you tell it to and if you tell it to do something which might break your system, it will go ahead.
Unlike regedit though, EasyBCD will warn you if what you have done has made the system unbootable, and try to stop you from rebooting until you've taken further remedial action. It can't physically prevent you from rebooting though.
Have you used it ?
If not, then it's completely unconnected with your problem.
If you have, what did you do ?