So i simply decided to turn vsync on and some effects on my ENB and now the game crashes even after reverting to earlier settings. What is going on ?

What ENB are you using? If it's one of the "heavier" ones perhaps it's too much for your system. Since the game is still crashing after reverting, maybe something from the ENB is still running.

I was just using ENboost and tried to turn some effects on. Ingame i use sweetfx and dynavision. I tried to turn vsync on through the control panel but reverted that as well.
I reinstalled enboost and everything should be fine, but it is not.

crashes where? What happens when you rename the d3d9.dll (disable enb)?

It still crashes without the ENB. It crashes instantly after the Imperial logo appears (i think a have a mod that skips the intro or something like that). So basically it crashes a second or 2 after turing it on.
And i'm sure this is not caused by mods as everything was perfect until i decided to mess with my graphics settings in the Nvidia control pannel and ENB settings like turning godrays on and such.