Help on installing on broken Vista Dell system

[medmondsr]

my old dell desktop had vista installed on it but something happened and it says i have reinstall vista before it will log me in. i want to install ubuntu on it but i have to do so through the DOS. so how do i accomplish this?

thank you very much :]

[LADmaticCA]

If you already have an Ubuntu live cd, just reboot your machine and enter the setup (Usually pressing F1 or Del). Once in the setup, look for a boot menu and an option to change boot device priority. Make sure the CD/DVD ROM is the first device. Save, exit and the machine should boot from the live cd.