Windows 7 vs Windows 8.1 vs Manjaro KDE 8.10 side-by-side install (VirtualBox) by tzzsmk

I got a crazy idea to compare installation of Windows 7, Windows 8.1 and Manjaro KDE Linux side by side all at once, in the end finished by Firefox installation; running in VM VirtualBox, each OS gets one cpu core, 2GB ram and relative same HDD I/O - host (Windows 7, i7-3770K, 16GB ram, GTX770) is running on one drive and all VMs on second drive, so the install speed is cca. 3× slower than regular, therefore you can see more precisely which OS install procedures are faster :Đ