I'm going to try (gasp!) to wipe this pc and want to install Windows 7 as the OS. It has Vista now and I hate it. I've been told to get the upgrade and choose to boot from the disc, how do I found out where the prompt is?
Insert the disc into the drive and restart the machine.
After the initial BIOS screen you should see the computer display a message saying "Press any key to boot from CD".
This happens when the screen is still in the black and white text mode you see before windows starts.
Should this fail you'll need to go into your BIOS configuration by pressing the appropriate key immediately after powering on the machine - this key varies but is often something like DEL , F2 or F10 - Once in there you'll need to ensure that your CD/DVD drive is first on the "boot order".