'Windows can't update the boot configuration' error in setup

[Frederick073]

I'm trying to install Windows 7 on my mid-2009 MacBook Pro, but every time setup is nearly complete, i get this error saying 'Windows can't update the boot configuration' and every time i try to restart setup, it just says something along the lines of 'an unexpected error occured, setup must restart to continue' and then restarts indefinetely. There is no Mac OS X or recovery partition on the HD, just a personal copy of Windows 7 for web browsing and media(I'm trying to install another 7 for work). I've already installed windows successfully more than once on here so I don't know what's happen

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