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There's already a question about removing an OS from a dual-booting machine, but that one is about Ubuntu and Vista, and I thought people may have different/more suggestions and answers for a different set-up.

So... I have both Vista (64-bit) and XP (32-bit) installed on my PC (different partitions) and I'd like to get rid of XP.
What should I do to securely free up the hard disk XP is installed on and make sure the Vista installation does not get messed up in anyway?

PS : Vista was installed after XP.

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up vote 5 down vote accepted

Install EasyBCD to reconfigure your bootloader and delete XP from the startup.

Then delete all the Windows XP data (Documents & Settings, Program Files, Windows etc), in case you have Windows XP on a different partition just format the entire partition AFTER taking it from your bootloader.

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+1 I second the use of EasyBCD. Very nice program, and enables your very elegant solution to the "delete my OS" solution. – Babu Jul 22 '09 at 20:50
    
Doesn't like to work with linux though – The Green Frog Sep 1 '09 at 8:46

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