Used Linux dd to save mbr of my drives to directory mbrbak
I disconnect power to linux hd when installing win7 to stop it removing grub
I might need to dd /sdb to /sda so seemed a good idea at the time
So not only did too clever for his own boots not /sdb to /mbrbak/sda but dd /sda to /sdb
You can stop laughing now
Any help much appreciated hd is Model: WDBMMA003HNC-ERSN 3/tb network