My understanding is that GRUB handles the boot loaders for all operating systems on a machine, and Windows being as prone to collapse as it is, removing GRUB would most likely have entirely wiped your Windows bootloader. Manager reported it fixed because there was nothing to fix, so it assumed its job was done (believe me, stupid things like that can and do happen with Windows).
I did once upon a time find out myself how to recompile the Windows bootloader because I did a very similar thing, the only difference being I was a complete idiot and erased the loader myself (long story!). I would run a quick search for you to try and find the guide again but I unfortunately have to get gone within the next ten minutes before I'm fired, so try Googling for "rebuild Windows 7 bootloader". Good luck!