Files found but when recovering seems to freeze

Hello,

I am trying to recover photos from a failed Hard Drive, which was running Windows 8.

I have connected to another computer (running windows 7) and have managed to recover all word and exel docs using recuva :)

I am now trying to recover photos.

When I scan with recuva they all appear, state - not deleted, comment - No overwritten clusters detected.

On selecting recover, the first time I tried, the time shown increased from 1 hour to 19 hours.

I cancelled this and tried again by only selecting 20 JPG's. Approx 10 of these were recovered, and then it seemed to hang and would not calculate remaining time.

If I select approx 5-6 photos the image previews, and then it seems to hang on processing the next one.

If I select approx 5 images to recover, the progress will start and then the time keeps increasing and seems to freeze.

Is there anything I should be doing to help recover the images?

Thank you