this works for me
Step 1: Run VirtualBox as administrator
Step 2: Go to File -> Preferences -> Network -> Host Only Networks
Step 3: Add a new one or just edit an old one:
Adapter Tab:
IPv4 Address: 192.168.x.201
IPv4 Network Mask: 255.255.255.0
DHCP Server Tab:
Server Address: 192.168.x.100
Server Mask: 255.255.255.0
Lower Address Bound: 192.168.x.101
Upper Address Bound: 192.168.x.199
credit: http://www.stackoverflow.dluat.com/questions/30951147/genymotion-unable-to-load-virtualbox-engine-on-windows-10