Vagrant Up Issues still

I have modest experience with VBox but am new to Vagrant. Which file in gswd-vagrant should I be using to start up in VBox native? This is the error I receive (below) althought Vbox is 4.2.10_84104_fedora17 and guest add-ons is 4.2.10. TIA

[default] Waiting for VM to boot. This can take a few minutes. The VM failed to remain in the "running" state while attempting to boot. This is normally caused by a misconfiguration or host system incompatibilities.
Please open the VirtualBox GUI and attempt to boot the virtual machine manually to get a more informative error message.

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Answers

[Solved] Reviewing log files, the dreaded VT-x error popped up. Checking BIOS and turning on Intel Hardware Virtualization worked for me. HTH, V.