Thanks Andreas - I have tried opening the file on the reset crashed computer directly from the external harddrive and also was not able to open the backup maker zip file. I have just downloaded pkzip (standard version for home use) as suggested and have tried opening the zip file on my laptop. I got this message 'Errors were found opening (file tree)\Dell XPS 140619.zip. You can extract files from this archive, but other programs may not be able to open it. Do you want to try fixing the problems? (Choice) Yes No' I have tried the Yes and No options and was able to open the zip file but was only able to see a small number of files which would be a very small portion of 39GB (exactly the same on Yes and No options). Maybe there is hope for me? I think the desktop may have shut down while Backup Maker was running which may be why I can't open the file. Otherwise it shutdown with errors which may have corrupted the zip file - I don't know. Are there any other options to open the zip file?