the zip is corrupt. try uploading to
http://imageshack.us/
if you know the level name then-
open the game starting shortcut by right-click>properties and right at the end of the target textbox add the level name
so if earlier it was c:\Program Files\SplinterCell Chaos\chaos.exe
then now it should be "c:\Program Files\SplinterCell Chaos\chaos.exe <levelname>"
click ok to save and double-click to start. then when the level loads press quick save key. after that exit and restore the shortcut and start again. now click continue/load quick save