GPT Drive format

I have a GPT drive that came with a Macbook.  I want to use it in a Vista Machine.  When I try to format it using the Vista startup disk it won't let me.  I can delete the partition, but as long as it is a GPT drive it won't allow Vista to install.  How do I convert this drive back to normal use for Vista?
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Could you hook it up to another vista computer with sp1 installed (which adds support for GPT)? There you should be able to reformat it to MBR.

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Windows Vista

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