Grub is installed on the 2nd h/d from what I can see - I asked the Ubuntu to use the whole of this h/d when prompted during installation and not to install Ubuntu beside my present OS (Vista) in it's own partition.
When Grub boots it shows 4 Ubuntu boot options and below it does show 2 Other OS Loading options, I think it calls it? I.E. Vista loading options. But once I choose either of these, it passes from Grub ok, to the normal text based Vista loader, like when you press F8 during post in Vista. But, then I just get a blank black screen after I choose any of the options given there by either Windows loader.
My Vista OS is still there, i.e. IO.sys, MSdos.sys, config.sys and autoexec.bat, but boot.sys has gone walkies. Probably my MBR has changed I don't know what Ubuntu does to the file system? Something has stopped windows loading. I have entered the c: prompt when I could, after I popped in a rescue disk and booted from it, but Fixmbr is not a recognised command - that's if this was the right thing to do to rescue my Vista - I really need it back.
Thanks for your help, really.