maybe it is time for you try to fix the corrupt file as i and many of us think it is corrupted..

i google some "repairing corrupt 7zip file" and find some links to several repairing apps..
and try also www.ask.com with the same question - "repairing corrupt 7zip file" and the result given might be helpful..

i usually use ask.com to look deeper in various discussion groups..

2.4gig, wow.. lots of filesss! goodluck!