There are a couple of ways to do this. One is with a product like ERD Commander 2000 ( http://www.purenetworking.net/Products/ERDCommander/), which lets you edit the registry directly without booting into a second copy of Windows. Another option is to perform a repair installation (see http://www.michaelstevenstech.com/XPrepairinstall.htm for full details on how to do this).
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