Im selling my desktop pc very soon and I would like to kno how I can wipe off everything on the hard drive so it can be like when I 1st got the computer. Its on windows xp.

Is there a Restore disk that came with the computer? If so just use that to restore it to its original state.

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Ubuntu 8.04.1

Gnome 2.22.3

Hello Gemma,
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As Dr. Computer has pointed out, you can just run the recovery disks, or on some machines, the recovery partition. However - if you've ever stored sensitive data that you wouldn't share publically on the machine, consider running Boot 'n' Nuke on the drive. It can take a while, but it would make it pretty hard for most people to extract any sensitive data [e.g online banking passwords saved in your password, family photos, etc.].
It's free and you can get it from: Darik's Boot and Nuke (Hard Drive Disk Wipe)

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I think there was. But I must of lost it.

I've used autoclave before, which looks to be the predicessor to Darik's Boot and Nuke. I works great by overwriting your drive several times so the information of it is completely unrecoverable. Then, through on a fresh installation of windows and sell the computer, worry free.

Warning: If this program works the same, then the higher settings (3 passes) took 1.5 days to complete on an 80GB hard drive. Just be prepared for that.