Hi Calin,
If now java is 1.8 and the bin directory is in the path , then it is likely not a java problem.
There are some configuration files stored in the C:\users\myUserxxx\sdb\DatabaseStudio\.configuration
directory and from the error message it looks like something can not be found.
Please rename the whole DatabaseStudio directory to DatabaseStudio_rem, so that
database studio does not find it on startup. In this case it will create the directory again on startup.
Do you get the same error message after renaming the directory?
Cheers, Péter