Rob Malpass wrote:
> 
> I know that I can get around this by booting from a DOS disk and doing 
> fdisk /mbr.   However - out of interest - if I didn't have an MSDOS boot 
> disk - how would I do this?
> 
> Cheers
> Rob
> 
If the other suggestions don't help, You could try 
http://www.freedos.org/ for a free re-write of DOS, it includes a 
version of fdisk which supports the /mbr flag.
Regards,
Alex.