I've tested latest build 4.3.15-95286 and now when I start a VM I get another error dialog:
After closing that dialog I get the E_FAIL dialog (VBoxStartup.log attached):
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Failed to open a session for the virtual machine c7a3.
The virtual machine 'c7a3' has terminated unexpectedly during startup with exit code 1 (0x1). More details may be available in 'C:\VMs\VirtualBox\c7a3\Logs\VBoxStartup.log'.
Result Code: E_FAIL (0x80004005)
Component: Machine
Interface: IMachine {480cf695-2d8d-4256-9c7c-cce4184fa048}
The previous test build 4.3.15-95226 worked and I could successfully compile the VB Addons for CentOS 7 as well. I've not tested any VM that has a GUI.
I'm running Windows 7 Enterprise, Symantec Endpoint Protection.