I solve this problem for me. But I still not understand why my previous profile is deleted.

For get-back your tabs you need restore deleted profile. get any program which can recover files deleted from your hard disk. find and recover your previous profile in folders: "\Documents and Settings\[your_user_name]\Application Data\Mozilla\Firefox\Profiles\[my_deleted_profile_name].default\" "\Documents and Settings\[your_user_name]\Local Settings\Application Data\Mozilla\Firefox\Profiles\[my_deleted_profile_name].default"

may be folder from LocalSettings is not necessary, it contains many cashing, but I don't know. I recover both of them. be careful, if you rewrite this folder before recover all what you need, the data may be lost, moreover it may be lost right now. So, Good luck.