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.

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Virtualbox

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