You need to set the boot order in the bios so the CD drive is at the top. Alternatively tap F12 repeatedly at boot to get the one time boot menu and select CD drive there. Also, is this spare hdd blank and unformatted or you already have partitions setup on it?
However, when I try and boot from it, I dont get the 'press any key to boot from CD/DVD' option, even though ive set the boot order in BIOS for CD first.
I have just discovered as well the spare HDD I have is now just two partitions full of music. It seems I wiped the previous Vista instal off it to use as storage. Can I still in theory format this drive and instal windows on it?