Hello Billcu,
I had the same problem after installing a dual boot Ubuntu 12 next to Windows 7 on our "big PC". Uninstall Ubuntu and Grub stays and causes more havoc than a bucket of eggs and a stick. There is a "super grub uninstaller" out there which can fix/remove Grub. Can't remember the site now but just google "grub uninstaller" and see what comes up.
Cheers from Aunty Jack.