OS X Mavericks installer on bootable USB boots with stop symbol

I've recently been trying to reinstall OS X Mavericks on my late 2010 Macbook Pro but I've ran into some problems.
I followed this guide to create a bootable USB to reinstall Mavericks. So first of all the copying took longer than it's meant to, which at first was a bit concering but I just continued. Then, once it had finished, I boot up from startup by holding 'alt' and selecting the drive. It boots up like it usally does, but then after around a minute it came up with a stop symbol and a spinner below. I've left it to load but nothing happens, I've rebooted and even tried to copy the files again.
It's not like this method dosen't work because I did it when Mavericks first came out and it worked without a hitch.
Any help would be appreciated very much. Thanks.

Eric Root wrote:
Make a bootable USB copy using the free program below. The program does all the work for you.
Bootable USB Flash Drive – Diskmaker X
What does it do if the dmg file is not on my comptuter?
Phil

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