On, my system I originally installed Windows 7 and then after that Debian. At this point GRUB would appear and I could choose to boot either Win 7 or Debian. Now after upgrading to the latest version of Windows 7, I no longer see GRUB and it boots straight into Win 7.
I tried fixing the problem using the Super Grub Disk's auto repair and boot features but it didn't work. I assume the partition for Windows has been made Active from upgrading, but I am not sure. Will the problem be fixed if I use a partition manager to set the Linux partition as active?