I've tried upgrading to VirtualBox 4.3.18 but that has not made a difference. We're stuck with the version Corporate IT has dished out. I can uninstall Symantec and VirtualBox becomes functional again, but unfortunately, changes to Symantec are not much of an option in fixing this. The only option left is to do a 3-second hold on the power button. If you try to launch any programs after that, nothing will come up. When you attempt to initiate a shutdown/reboot, Windows does nothing. The worst part, is you cannot even shutdown the PC. I've tried every trick I know to kill the process including: Windows Task Manager -> Processes -> Right click and select Terminate Process Explorer pskill taskkill /f /pid. You can see the VirtualBox.exe instance running in the task manager, but if you try and kill it refuses to go away. Since then, when trying to start a VirtualBox guest (doesn't matter what guest), nothing happens. A couple of days ago, our Corporate IT decided they were going to silently install a newer version Symantec Endpoint Protection. We were running VirtualBox 4.3.16 on a Windows 7 Enterprise SP1 圆4 host.
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