Hi Sunco,
SQLyog.ini file stores all the connection settings. It is present in 'AppData' folder.
Exact file file path is:
For Windows 2K/XP/2003:
C:documents and settingsuserapplication dataSQLyogsqlyog.ini
For Windows Vista/2008/Win7:
C:UsersuserAppDataRoamingSQLyogsqlyog.ini
Please note that the 'AppData' folder is a hidden folder. You need to unhide it from Control Panel .. folder options.
You need to copy/backup this SQLyog.ini file and paste in AppData folder (same path) of the system where you are going to install new SQLyog.
Regards,
Khushboo