First installation of VirtualBox. It gives the error "Failed to create the VirtualBoxClient COM object. The application will now terminate. Callee RC: REGDB_E_CLASSNOTREG (0x80040154)" on starting.
I originally ran the installer not as Admin - not that it complained about anything - and encountered this error.
So I've done a System Restore, and followed the instructions in wiki/MSI_Logging for logging the installation - the two registry entries AND running the installer with the '-l' option, from a 'Run as administrator' command prompt; using all the default installation options (but selecting 'always trust software from Oracle').
There is NO log file created in C:\Users\<Your Username>\AppData\Local\Temp !
Still the same error when it runs; also when running as administrator. Also switched to a 'local' login on the PC [my normal one is an Active Directory account], and that also errors.
"VBoxSVC.exe /ReRegServer
regsvr32.exe VBoxC.dll"
[from admin command prompt] doesn't error, but doesn't fix it.
I've searched for a fix, and seen mention of 'VirtualBox services' - yet I've not spotted anything in services.msc (started or not) which looks like a VirtualBox service.
How can I debug this further?