one off clone of clicking win 7 hard drive

So my hard drive has clicking noise and is maybe going to die.

I want to clone the faulty internal HDD to a blank external HDD and then swap the HDD.

I am using Norton Ghost 15

I tried to ghost the C: drive onto a USB drive.

The file system copied but the drive will not boot.

It says 'BOOTMGR is missing'

The options dialog looks like this (although the options are not greyed out)


I checked 'Copy MBR' and nothing else.

I did not check 'Set drive active (for booting OS)' since I was worried this might render my original C: drive non-bootable ?

Maybe I do need to check 'Set drive active (for booting OS)'?

Any advice welcome.

Thanks