it appears that The Saboteur has some problems with ATI Cards. Fortunately, Electronic Arts is aware of the problem and they’re working on a fix as we speak, but you could still try a fix on your own. Here is what to do, according to the game’s community manager:
Turn off cores: (Windows 7)
1.) Open MSCONFIG (You can open it by entering MSCONFIG in the search bar)
2.) Select the “Boot” tab
3.) Click on “Advanced Options”
4.) Check “Number of Processors”
5.) Select “1” from dropdown menu
6.) Click “Apply”
7.) Restart
Turn off cores: (Windows Vista)
1.) Open MSCONFIG – Start> Run > Type MSCONFIG
2.) Select the “BOOT.INI” tab
3.) Click on “Advanced Options…”
4.) Select the check box for /NUMPROC= set it to 1 & click “OK”
5.) Click “Apply”