I recently migrated to Linux Mint and I am trying to install Windows 10 but the Virtualbox is stuck on the Windows Logo. I downloaded the iso from Microsoft. I have allotted 3.5 GB RAM to the vm.
Try disabling paravirtualization:
Settings -> System -> Acceleration -> Paravirtualization Interface: None
I was able to start installation of Windows 10 (64bit) on VirtualBox 5.0 Ubuntu by disabling this feature.
I removed VirtualBox 5.0 and installed the Oracle VirtualBox 5.1 and it went through. No other options helped.