virtualbox.org

When I installed Windows 10 Technical Preview and other OS's, I cannot find out how to make my guest OS full screen and automatically adjust to the window size. I installed the guest additions and 3D acceleration is on.
I tried turning on auto re-size. Nothing has worked for me. Are there any problems with my version of VirtualBox? Please tell me if you need any more information.

My details:
VirtualBox version: 4.3.22 and it is form the downloads page
Host OS: Windows 8.1

Thanks in advance.

Moved to "Windows Guests".

Attach the vbox.log (compressed) for one of your guests. W10 if you like.