virtualbox.org

Hello,

I've had this error: Callee RC: E_NOINTERFACE (0x80004002) with virtualbox 5.x, 4.3, 4.2
Posted in 5.1.4 thread - no reaction from virtualbox team, so I've started debugging by myself.
And it worked. In my case the problem was because RegQueryKey of HKCU\Software\Classes\CLSID\{00020420-0000-0000-C000-000000000046} returned BUFFER TOO SMALL
So, I've deleted HKCU\Software\Classes\CLSID\{00020420-0000-0000-C000-000000000046} and now Virtualbox starts.

New error when I press Start button for VM:

Failed to open a session for the virtual machine CentOS.

Result Code: E_FAIL (0x80004005)

But at least Virtualbox starts, so will continue debugging. So, the problem is 3 years old... See ticket https://www.virtualbox.org/ticket/12087

Finally, it works!

I've posted a solution here:
https://www.virtualbox.org/ticket/12087#comment:57