I would do two 40GB partitions on that hard drive for Vista and XP.
Considering you use only 12GB at most, that should be plenty. And your old
computer from what you said would have worked fine with Vista except I might
have thought about a hard drive upgrade and a better video card, (although
they'd probably work okay) so your brother should be able to run Vista on
it.
I would have said that too, since I am using 20 GBs, I have installed
Office, Encarta, Money, Photoshop, Flash, Nero and I only have 5 to 6 GBs
left. From the sound of things, Jeff is probably gonna be using just Office
and probably regular software such as Nero, so I believe he would be
contented with 20 GBs. But, if he plans on acquiring the final product, and
would like to have both XP and Vista on that computer, I would give it 40 GB
or 50 GBs. (This is BETA 2 of course).

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Andre
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>I would do two 40GB partitions on that hard drive for Vista and XP.
>Considering you use only 12GB at most, that should be plenty. And your old
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>>>> stumbled in here a few weeks back:-)
>>>> Jeff