Mac stuck hangs hanging on Virtualbox install?

Here is how you fix this...

When it does this:

Step 1.) Shutdown your Mac completely and wait 40 seconds before powering on

Step 2.) Mount the dmg file

hdiutil attach /path/to/VirtualBox-OSX.dmg

Step 3.) Install with Sudo privileges

 sudo installer -package /Volumes/VirtualBox/VirtualBox.pkg -target /

Thanks to: 

Pervoliner over there at Virtualbox mentioned step 3 and it worked like a charm..