Reddog, if you'd like, download WinRAR and use that to unzip it (you don't have to pay anything for it). I've noticed with the really large .zip files, such as from ORBX, the regular windows unzipper won't work for me and it will throw up that same message - where as WinRAR has no troubles, with the exact same .zip file.
thank you very much, worked as u said it would
