What you want to do is enter your BIOS and set the primary boot device to your CD-ROM (usually d:/) drive.
I would try a System Restore or re-install before a reformat. However, if you don't really care about anything on your computer, a reformat is simplest.
I would try a System Restore or re-install before a reformat. However, if you don't really care about anything on your computer, a reformat is simplest.