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Your laptop probably has a recovery partition. What laptop are you having? For HP just start tapping F11 as soon as you switch on for restore to factory settings option. You can find a lot of suggestions and workaround when you google with "reformat laptop without disk" such as: http://forums.comodo.com/general-security-questions-and-comments/how-to-format-my-laptop-without-the-windows-vista-cd-t35592.0.html http://answers.yahoo.com/question/index?qid=20071204154045AAWk4Kr http://answers.yahoo.com/question/index?qid=20080210044607AAZ52N5
By the way, this forum is for questions about Windows Forms programming issue, this question if off topic here. I'm moving it to Off Topic forum to see if some one interested. Thank you for your understanding.