Ok. Thanks. There was no hidden partition on this laptop....the restore disc has everything on it. (except the capability to install a barebones XPHome, of course) Also, I was told by the salesman that if I ever formatted the HD, my warranty would be voided, which is kind of funny because the restore CD itself formats the HD. So, what I did was purchased another HD, and kept the original one untouched, just in case. The warranty just expired, but I had formatted a few times with no problems...have had XP Pro, several versions of Linux, and a couple of dual boot XP/Linux installations.
By the way, my laptop is a Toshiba Satellite L-25 S121. The Mandriva One 2008 Linux installs and works great. This linux version has 3D desktops, and if you set up a dual boot system with WinXP, it reads and writes to NTFS partitions perfectly. All hardware is recognized, and the wireless networking sets up and works automatically.
Thanks again for the responses to my question.