Did you make the images with the GUI, or with the command prompt?
If you used command to make the images, you may need to find them from command too.
Boot up 7 dvd/recovery disc/wim , whatever, go to command prompt, type:
( find the drive letter for the partition you stored the backup images on )
wbadmin get versions -backuptarget:<drivelleterwhereyoustoredtheimages>: