Probably best to create a Windows 7 installer from flash using this tutorial: USB Windows 7 Installation Key Drive - Create
Then you not only have the needed Repair console but can later clean reinstall Windows 7 for a much better install.
Or you can use above method to write just the Repair Console to flash: Download Windows 7 System Recovery Discs — The NeoSmart Files
Mark the Recov partition active in Disk Management, or if necessary boot into Windows 7 or Repair flash drives, click through to Recovery Tools list and open a Command Line, type:
SELECT DISK # (for Recov partition HD)
SELECT PARTITION (for Recov Partition)
If recovery partition is not booted upon restart, boot back into the Windows 7 Repair console to run the same Commands but replace ACTIVE with INACTIVE.