How can I resolve the error "Callee RC: REGDB_E_CLASSNOTREG"?

According to this article, this can be fixed like so:

1. Open a standard command line ( Run > cmd )
2. Run: cd C:\Program Files\Oracle\VirtualBox
3. Run: VBoxSVC /ReRegServer
4. Run: regsvr32 VBoxC.dll

Make sure to run the Command Prompt as an Administrator.

But I find it confusing that this happens directly after installation. You may want to report this issue on the VirtualBox Bugtracker.

I have the same problem after de+reinstall VirtualBox.

Good hint, Oliver Salzburg! It didn't work for me under Win10, but brought me closer to the solution:

• Open start menu, right click on the VirtualBox link
• Click on open file path - explorer opens
• Right click on VirtualBox link, then settings
• Under compatibility click settings for all users button
• Check execute program as administrator
• ok-click all windows

'Strings' may vary due to translation.

Surprisingly (for me), execute program as administrator even makes a difference when using an admin account. This is also important for Oliver's solution (as I learned today after >15 years Windows experience.