You will need a third party disk management utility, like Acronis Disk Director, or similar, to do that.
A Google search on "XP resize partition" will provide a variety of solutions. I known for certain that Acronis Disk Director works as expected 100% of the time, but you have to make up your own mind about the other solutions that you may find as result of a Googel serach.
Cheers,
Bill
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I don't work for Lenovo