Goto the directory (Place that you installed Game) C:\Program Files\Ubisoft\Tom Clancy's Splinter Cell Double Agent\SCDA-Offline\System,
Create a shortcut for SplinterCell4.exe, and into this shortcut (Target Field) add "C:\Program Files\Ubisoft\Tom Clancy's Splinter Cell Double Agent\SCDA-Offline\System\SplinterCell4.exe" -ll
It will work.....