SABRE has a lot of Image confirmation/Captcha option and a  E-mail confirmation option to prevent spambots from registering for your Blog while keeping real users from being able to join your blog very easily.
This plugin will prevent your WordPress Blog from being taken over by automated Spambot registration, so your MySQL database won’t be flooded with fake users and spam comments from spambots if you have your blog set up to only allow registered users to comment on your posts. This will prevent you from wasting up MySQL database space which you are paying for, and you would not have to spend as much time deleting spambots and spam comments.
Virtual Box uses virtual machine files which you create to run virtual machine files within Windows or other host operating Systems like Linux. It is a good idea to backup your .VDI virtual drive files.
All you have to do is go to device manager, and right click the VirtualBox network adapter and pick “browse for driver on computer” and direct device manager driver update program to  C:\program files\sun\VirtualBox and make sure sub folders is checked. If you still have network problems, reinstall VirtualBox and try to manually update the VirtualBox driver again in device Manager.
Also, check to see if your firewall is blocking Virtual Box. If it is, then unblock it or temporarily disable your firewall. You can also check your network settings for Virtual Box in your Virtual Machine settings and going to network, and make sure NAT is selected. If NAT does not work, try the other selections.