Sharing the knowledge with us would be nice... What software have you bought and how expensive was it?

Sorry, I forgot to do that Was so elated that I managed to fix the problem myself

You can download the program from this page: http://www.datarecoveryuk.co.uk/software/windows/

As you see on the page it costs as much as $79, witch is expencive. So I recomend you look for alternatives before you buy it (I just wanted to fix my problem and didn't look any further..).

The program helped me to recover my backup. But I lost all the appointments and notations in my calendar and my playlist and other files I had downloaded into my N900 in the last month. Happily for me nothing very vital was lost

Hope this helps!

Then there's also the free, open-source Photorec. Worth a try at least.