When i checked from Tixati Shell integration menu the program say that Tixati is the default torrents handler , but it's not the case, i had to make it default using windows explorer.

OS: Windows 7 sp1 32 bit.

Perhaps you have another torrent program which "steals" the file association when you run it ? That's easy to happen if the program is configured to force file association each time it runs. Make sure it's not the case.

Not in my case , i uninstalled my other torrent client before installing Tixati.