|You might be able to claw back some of the data using a program such as recuva.|
You would need to recover the files from %appdata%/[username]/roaming/skype/[skypename]
[username] is the username to your computer
[skypename] is the skype username
I can't find any human readable files in this directory, but according to this page this is where they will be.
I would advise
1) Backup existing folder to USB flash drive / external media
2) Perform recuva on the [skypename] folder, saving the content onto an external drive
3) Copy the recovered data into the [skypename] folder.
I hope that this works, and please post back any progress.