Grub2 Not Booting into Windows 7 After Fedora 17 Install



I have a number of dual boot machines working fine with earlier versions of Fedora.  After a Fedora 17 install I get, along with at locale file error message flashing up

error: invalid signature
Press any key to continue

And Windows won’t boot.  Following the example in the posting I made the change of adding

set root=(hd0,msdos1)

and everything works just as it should.