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Anytime you reimage you run a risk that the System MBR (boot-critical files) doesn't get reimaged correctly. This is why some fancier imaging programs have you tick a box to take extra steps so the MBR gets copied.
If you reimage and Win7 won't start up, simply boot the Win7 DVD repair console or Repair CD - which you should have handy for repairs anyway. Click through to Recovery Tools list to Startup Repair - Run 3 Separate Times to repair or rewrite the System MBR and start Win7.
In rare cases in a Dual Boot or OEM factory installation where another partition which is not being reimaged was System partition, in order to get Startup Repair to write the MBR you may need to mark Win7 partition Active first: Partition - Mark as Active