I have been using Genymotion for about 4months now and all was well until I updated Virtual box to 4.3 . I did not like it because I didnt know how to run 64 bit OSs on it,so i
Click on "Open Network and Sharing Center" by right clicking network icon
Open channel adapter settings
Click on Properties of VirtualBox Host-Only Network by right clicking
Enable Virtualbox NDIS6 Bridget Networking Driver by tick on box and click OK button.