The BIOS does not set for Vista only. Do you know what the BIOS is Basil?

When your computer start up you can use the F2 key (at least on my
laptop it F2) to open the System BIOS set up. Here you select the Boot
tab (at least on mine it that tab) and reset the boot priority to CD.
Remember after the install you need to go back and change this to HDD.