VirtualBox Re-install VirtualBox-5.2.2（Windows）

Oracle VM VirtualBox

http://www.oracle.com/technetwork/server-storage/virtualbox/downloads/index.html?ssSourceSiteId=otnjp

Windows Installer DL

VirtualBox-5.2.2-119230-Win.exe

Guest Additions

Guest Additionsのインストール

https://www.youtube.com/watch?v=29PXbbXFD8c