Hi theemor,
VirtualBox is not a VMware product, so instead of asking for help in the VMware Communities, you should probably head over to the VirtualBox forums and ask your question there.
I know little about VirtualBox, but I can offer some generic troubleshooting advice: Reboot the host machine, remove and reinstall VirtualBox, check that your host antivirus/antimalware software isn't interfering. If none of these get it working, include the information about what you've tried when you post over in the VirtualBox forums.
Hope this helps!
--
Darius