Hi there, if you lost your skype chat history (i mean all what you said on chat with your contacts) and now you see like nothing has been said, you might made a backup of your skype folder or configuration file so you can restore it.What is the file where are stored Skype chat history?
C:\Users\yourwindowsusername\AppData\Roaming\Skype\yourskypename\main.db (if you cant see these folders, you may try enable show system folders and files (Google it)if You use SkypePortable
This is important folder, and you may backup it. Handy is to backup straight from Skype
Skype > Contacts > Advanced > Backup Contacts to File...What is the file with skype configuration?