New
#11
Type "compmgmt.msc" into the Start Menu search bar (note: I have a modified "Start" icon) and hit [ENTER]:
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Then select "Disk Management":
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Right click on the disk and pick your poison:
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Personally, I prefer MiniTool Partition Wizard Home Edition.
If, when she gets back, and you discover she has forgoten her password, try here:
How to Reset a User Account Password in Vista or Windows 7