Mass Effect 3 Mouse lag

I am getting mouse lag in ME3!
I have 6 GB of RAM, AMD 955 BE quad core @ 3.2GHz, and a GTX 460 SE with 1 GB of VRAM. I think my system can meet what mass effect wants.
However, I am still getting mouse lag, even if I tune the settings down to 1270×720.
I have a big suspision that it is V-Sync, is there any way to force it off? This mouse lag is runing everything for me
Answer #1
I’m assuming you are running the demo, in which case you needn’t worry because demo’s often have problems due to limited customisation options. With your specs you should be able to run the game with ease.
Answer #2
While playing single player or multi player?
Answer #3
You can force v-sync off via your Nvidia control panel or Catalyst.
Answer #4
I really hope the final game has something like defultengine.ini, I hear you can force the games v ylsync off there, this true?