I'm sorry to sound a little short / rude and appreciate any help that people give .. maybe I'm not very good at explaining things... but in my opening post I did explain that I can't choose an IDE drive as a bootable device - it simple isn't in the list just SATA and USB. My DVD drive and the primary OS drive are both IDE. I guess good old IDE while supported isnt much of a priority anymore in MSI's Bios', I can pull up a boot menu during post and from here you can choose to boot off an item which is what I have been doing.
Even though the IDE drives are not selectable in the BIOS settings list as bootable drive - it was working fine - so I assume after it checks all the other devices for boot options it will then move onto the IDE devices, though the DVD drive being a slave to the master HDD it never gets a look-in as bootable unless you use the option to select the drive during boot from a boot menu.
In any case my actions as listed have all been through the XP Pro disc and it doesn't show the option to repair my installation, I only have the choice to repartition and install on the drive - ie lose everything thats on it.
Since From a consol prompt I can see the drive, log in as an administrator I fully believe that their must be a way to get it booting again - I just don't know any other options but those I have tried.