Recovering from external drive/server memory problem

Hi there folks..

Firstly, great product, really superb. Lifesaver for me on countless occasions...hopefully this time too...

I run XP on a laptop that was running out of memory so I got an external server which I was using as backup with HP backup utility. It deleted from the server but I'm pretty confident that all my photos and stuff are still there.

So I downloaded Recuva onto the server but when I run it and it gets to the end of the process (deep scan), it just comes up with error message

Ran out of memory

and nothing else....

Is there something I'm doing wrong?

Thanks for any assistance...

B