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I am working on a project for which I need to make a specific and lightweight linux distribution. I have made a custom LiveCD ISO based on Lubuntu 12.04 for my project, and when I try running it in Virtualbox 4.2.6 it starts all right and gives the boot options menu:

However, when I check the disk for defects, it says there is one:

I need to know exactly which file the problem is in. It also will not start the livecd system or installer, supposedly for some sort of BIOS problem:

Please note: I have a deadline on this project.

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This may be a problem with VirtualBox not necessarily a problem with your .ISO. Try booting from the .ISO in a local machine.

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