First try a bare bones install (no networking, USB or python - just the top level ticked). This succeeded for me, but required a reboot.
Run the installer again, and remove the installation
Run the installer (yet) again, and this time it succeeds.
I tried this method and it doesn't help. I was using 4.0.xxx version and install 4.1.2 without removing the older version first. Now I get the 2869 error. I'm running on Win7-64 OS and also tried with "admin" method also...
Any help would be appreciated. VBox was running great before trying to upgrade to 4.1.2
I have tried CCLEANER to clean the registry. the Windows Uninstall Utility has no entry for VirtualBox.