I’ve finished a playthrough of Dead Island recently, and I just want to share a simple procedure to force antialiasing using Nvidia Inspector.
Just go to profile settings, load up your Dead Island profile, and set Antialiasing Compatibility to 0x0000F0C1 (S.T.A.L.K.E.R.: Clear Sky, S.T.A.L.K.E.R.: Call of Pripyat, S.T.A.L.K.E.R.: Shadow of Chernobyl).
Then set Antialiasing – Behavior Flags to None.
After applying those settings, you will be able to change the antialiasing mode and setting via the nvidia control panel, or you can use Nvidia Inspector to directly change Antialiasing – Mode to Override application settings, then select the value you want for Antialiasing – Setting.
Here are a few screenshots using 8xMSAA: