Windows 8 Installation Issue

I recently installed Windows 8 consumer preview using Oracle Virtual Box. I have done the necessary configurations and this error got displayed as I start-up.

Your PC needs to restart. Please hold down the power button. Error code: 0x0000005D Parameters: 0x03062502 ...

Any idea of what's causing this problem & What should I do to resolve it?

I just resolved the same issue. Take a look at this post. The idea is that you need to turn on the BIOS option (on your host machine) to prevent execution in non-executable memory segments.