Hello Anette
Thank you for providing the additional information.
I had a similar problem some years ago on a Windows 7 64 bit system which only had JDK 1.8 installed: I was also unable to register the 3 Java Beans.
On the failing PC, I got the error message that the controls could not be found on the path C:\Program Files (x86)\Java\jre1.8.0_112\axbridge\bin, even though they were there.
So my first question would be: Can you see any error message referring to axbridge ?
On my PC only JDK 1.8 was installed as is on yours. At that time, I compared that PC’s configuration with another PC where I did not experience the register problem. It turned out that on the PC where I did not experience the register problem, in addition to JDK 1.8, JDK 1.7 was still on the system in parallel.
So for a test, I installed JDK 1.7 in addtion to JDK 1.8 on the failing PC and could then successfully register the 3 Java Bean Controls PVTab, PVTree and PVCalendar.
The reason for the error was that the ActiveX Bridge had been removed from JDK version 1.8, (and also in some parts already at 1.7, but registration worked nevertheless).
Also, it turned out that the registration of ActiveX Controls had to be done only with jre6. (What you did, as you wrote)
Of course I do not know whether our situations match, but it is perhaps worth trying whether registration is successful when JDK 1.7 is installed in addition to JDK 1.8, especially when you find error messages referring to axbridge as I mentioned above.
Hope that my hints can help you solve this error.
Best regards
Anette-Nicole