Hi people.
I'm trying to install the complete Forms 12c development environment on a Windows 7 machine.
I've successfully installed on the same machine: 11g database xe, JDK (6, 7 and 8 are installed), WebLogic Infrastructure 12c and Forms and Reports 12c (using the option "Forms and Reports Deployment" on the installation program).
On the summary screen before installation, it was saying that the Forms Builder was going to be installed, but it created no such icons for this application.
So, after everything got installed, I tried the "Standalone Forms Builder", but I'm getting the following error:

It seems that it's already installed? If yes, how to run it? If not, how to correctly install it?
Also, when executing the SQL Developer that got installed by "Forms and Reports Deployment", it returns the following error:

That's why I have JDK versions 6, 7 and 8 installed. Had only version 8 installed and when tried to run SQL Developed said it was certified only for version 6, so installed versions 6 and 7 anyway, tried to run with the three java versions installed, but the error is the same.
Thanks in advance.