Your Windows MSI installer database has gone south.
1. Download the Windows Virtualbox version exe from
https://www.virtualbox.org/wiki/Download_Old_Builds
2. Make a temporary folder on you computer to hold the extracted files, like C:\VBOXMSI.
3. In a regular command prompt window, drag the downloaded exe file. The full path and file name of the exe will appear at the command prompt.
4. Type {space}--extract{space}--path{space}
5. Drag the temporary folder you made on the command window. The path and name of the folder will appear in the command window.
6. The command will look like this:
Code: Select all
drive:\path\to\VirtualBox-[versionnumber]-Win.exe --extract --path c:\VBOXMSI
The MSI will be in that temporary folder.
{space} means a single space character from the spacebar. Sorry to be pedantic, but some folks interpret this like the person who, when told to right-click the desktop, wrote 'click' on the top of the desk...
Note there's one annoying glitch with the installer. A message box which does not have an accompanying icon in the taskbar will display the results of the last command. If you leave this message box open, further runs of commands with the .exe file will not do anything. You will have to find the message box and close it. And if you minimize all the windows with the Desktop Peek tool you may not be able to find it to close it.