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#11
All of these commands are automated in Win7 Startup Repair, something which wasn't fully known at the time this thread was first active.
Boot the WIn7 DVD Repair console or Repair CD, click through to Recovery Tools list to run Startup Repair to run all the necessary tests and repairs, including rewriting the MBR if necessary which might take up to 3 separate Startup Repairs with reboots: System Repair Disc - Create
If this fails, make certain that Win7 partition is still marked Active then run Startup Repair again repeatedly: Partition - Mark as Active