Thread:Project:Support desk/Home-wiki is lost... How to restore it?

I've had a MediaWiki installed on my PC for several years and been constantly using it. I've stored quite a lot personal information in it. And several days ago all was (probably) lost! The version of MW was quite old (either 1.9.3, or less probably 1.16.5), several days I had problems with access to MySQL and phpMyAdmin and so I've tried to upgrade but apparently did everything wrong. My actions which I can recall were like:
 * 0 I had Xampp 1.6.0 on Windows 7 in directory c:\xampp

After that I cannot find my old wiki files like *.MYD neither in mysql/data (in both xampp and xampp-old) nor even in deleted files (R-Studio shows suspiciously few deleted files on c:). The question is: where database of MediaWiki is stored (backuped? logged?) on computer? Can I restore home-wiki in some way?..
 * 1) I've installed a new version of Xampp in c:\xampp-new
 * 2) After I discovered that xampp-control is doing something bad (not remember exactly now), I've moved old distribution to c:\xampp-old and a new one to c:\xampp.
 * 3) I've installed Bitnami Mediawiki 1.22.1 and it starts well but it was a new wiki.