I noticed during the installation of Melvin's 777 v2 that the process overwrites the 777v1 files because they have the same file name in the FS2002\aircraft folder.  I installed all of the v2 liveries and noticed this too late..  I lost all my information in the aircraft.cfg, panel.cfg, and the sound.cfg because they got overwritten by the v2 installation.  

Just a warning to those who intend to download MelJet's 777 v2 to rename your 777v1 files to another name, or your .cfg's will get overwritten.

That's what I experienced, anyways..

*sigh*.. gotta rebuild the .cfg's..