The version 5.0.2 as an issue on Windows 10 both guest and host but those test build are already fix from the revisions.
Please be aware that Windows 10 is not yet officially supported! There are known problems with VirtualBox 5.0.2 on Windows 10 hosts and with Windows 10 guests. Some of the problems are fixed in the most recent test build which can be found [URL='https://www.virtualbox.org/wiki/Testbuilds']here[/url].
Try to conduct a clean reinstallation because those complications should be fix easily.I've encounter numerous rare errors on Virtualbox that can fix easily.