ooops... actually, let me take foot slightly out of mouth as i notice that kb is a bit older...
so let me ask
1. Do you have a recovery CD that came w/your computer?
2. Over last couple years, the manufacturer's got cheap and dont' send the CDs with new computers but instead install recovery partition on the drive (may be hidden so you don't normally see it)
3. Typically, to get into it, as soon as you power on and machine starts booting start tapping the F11 key and you should get to the recovery prompt
So u have a CD? And what make/model computer is it?